Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ef2798ebe4fc1a…

MALICIOUS

PDF

103.1 KB Created: 2021-07-05 04:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 58df4d3f237123cc6b94dfe7b1375fc7 SHA-1: f394348aa99df56acc4b4f2a1dcdacb50bfa69f2 SHA-256: 66ef2798ebe4fc1a7d65c4beec543442f0797cd2d4c1643d1566c6f2f1a8cd82
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external resources, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded links suggest an attempt to lure users to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9685

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607effa45e65d---gikapuwogutebivinalenuwo.pdf In PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6f2874b03---gilubukis.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/39390589886.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/86d078fb14468b6ba29c46d942035b5a/96361970914.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2af84d862---15758073188.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/xononisi.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/68910492862.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/9e3d0336afc90fc166de33abcd745d63/43133615432.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/5c959ca89099f40c9f1f79f811414466/61258542746.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/80505218881.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade19c53f27---rifevob.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1e0b40bb1---75609114490.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///zerukewomitala.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bca45c98c---fikovizaxenijorugemose.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/8010b22d9f201b3f05835d179c26ebf3/44896388682.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/6c9e6e56277d4555eea06273c46c5ac6/mufozemokujis.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/wisadademede.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/fqv17224s1c3uhe4io2293ar68/3372249278.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/1a1df40276d7c531b2c3efae607f8c93/fevujisepelupetudi.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/8121402851.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/89337002685.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088082f6872e---41836785355.pdfIn PDF document text
    • http://elitvorota.ru/f/file/bonarobinedibamo.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b977937e05c---rakitudaxunovugere.pdfIn PDF document text
    • http://somogroup.vn/ckfinder/userfiles/files/77906077854.pdfIn PDF document text
    • http://hyderabadibiryanicorner.com/admin/images/file/majovek.pdfIn PDF document text
    • https://kede.org/userfiles/file/maxaxatanitixoveze.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a676c9a31d6---devek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=beauty+is+in+the+eye+of+the+beholder+platoPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13653 18496 bytes
SHA-256: 98c5853d59dc4fcc6fd7ffedca3fbf09e9bdf8bd941f25eee57cf22b05fa3196
font_02_sfnt_off0001663a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1663A 3168 bytes
SHA-256: 0a44c6dbea3e15c083376e920ea3ac78c9832068f2c8e8275a6a8fce1d65f65c
font_03_sfnt_off000172dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172DC 11000 bytes
SHA-256: c3f36e0de87489810995dc415b70ca77ef27a4180cbba7f57d8ccae30542f686