Malicious PDF — malware analysis report

Static analysis result for SHA-256 61f16c9ae63cc2bf…

MALICIOUS

PDF

85.4 KB Created: 2021-06-29 11:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ec146f8c8cbe37b71dbaf05fcc3acf0b SHA-1: 71460bc7868d1de17d902eba2246dda3c621c601 SHA-256: 61f16c9ae63cc2bfd6257c48f0b5ccf26a4eeb5c1c1ebbb44ded2acf41a76c70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or redirection attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious content or further stages. No scripts were extracted, but the structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/fcffa3a7c1f7727c2b3e427a91c16803/68916751275.pdf In PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/1d4244f9bceb49c16b675936aab29a66/19902830706.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/8928772648.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/34083142147.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/67568060483.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/402856998.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/eg9rek53e8g81peeme87vppb4q/44281408292.pdfIn PDF document text
    • https://agatanorek.com/files/file/xefemirojepogoboborobir.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/beguvetifagosijariroduxu.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/41212859944.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/31668142071.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/dibazopovafovekaga.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/5bbca6d51fde4d4b901d2c13ce4d7535/dimizadagekot.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/26913705438.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080a3688db4c---12389739561.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/lezimuserufutav.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/giwimiki.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/9f980e69f27714816f322b6a86b8851f/13797277125.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b68478604b2---boxofog.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/1e756af52a88e3e25c3808a863024ff0/ziwilogovuminoraxetawij.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/29049f7d864e48923fbaa699a9a10225/77329178676.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4d4453957---zepanusirurosezaw.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/a9d1quq9edmgc8gf918nrppbeo/33290963150.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/7cb30b539100b7db5da2b14bc9b0402d/2997446620.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/22j76it3omi8vbsuc37kpb7fdj/28304983741.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=purpose+of+coumadinPDF 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_off0000eaaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAA 17384 bytes
SHA-256: 0086151bb3becba95bca468150392157ee0b54a5502fab4377d6c1e279d7a317
font_01_sfnt_off00011871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11871 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13088 10740 bytes
SHA-256: b9a27c59015734ac178e3290bbaede2584fd5cccf304df85ed0c325997883358