Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dfb8219db4b9cab…

MALICIOUS

PDF

75.9 KB Created: 2021-09-07 09:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c2ef24e30d13c16022ec98ccbef07a57 SHA-1: 5fd9dcbd782d152c2e27ed28ba7f2104ec11f926 SHA-256: 4dfb8219db4b9cabf82f3d62464c5087ac431562f99df22c096cdbed449c6589
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/43d91313ffae792f7faf00d6b64d423b/galorijuloxisemagibak.pdf In PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160702a3b825bb---76439181964.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/i1dcighur10ue61sa0o4dqukr6/4177616268.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/tibopixinupirowu.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/gofavimu.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/rijuzo.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b754c99d8f1---suzupamupozumamiw.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/nokedofawobuselejukul.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/84410238649.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd555e7460d---tukobanodo.pdfIn PDF document text
    • http://popmetre.com/news/files/gewarufetojikarudiwu.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/58591940959.pdfIn PDF document text
    • https://littlelightnepal.org/userfiles/file/35872798812.pdfIn PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/jisegelixebaginerineg.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/ba700842b5ff3fd6961450a13465d3b5/58287484945.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/892980876.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608395290fe5e---10943041134.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/4320474503.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/55995148569.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/48960251289.pdfIn PDF document text
    • https://avela.md/userfiles/file/91910675847.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/nidijewoxiwurelabib.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/9julli41f80383n5b8cfh1auv0/64998836138.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f340ae542---dezosu.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/qnoeggn68mf51b4t73ur5sobi3/53449825144.pdfIn PDF document text
    • http://01host.ru/userfiles/files/vegebepajawakixawiwipim.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/d89c5b12d4d43e37d0d25e47e00f615c/19814479111.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/b6652381521c8fd4e71e9cf74b6524e5/gaxubejitawagebefij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=time+the+science+of+exercise+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FC 10740 bytes
SHA-256: 9dd0839fe2144ac99ec7830f850ffa113183f9a934aeda5e11e0cbe8ae91899c
font_01_sfnt_off0000db80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB80 17964 bytes
SHA-256: 55d91f29963e90d0d0abe9708d98512adf62e5ca585057ddb34962a6b2930f11
font_02_sfnt_off000109e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1