Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cc50f1d91aad840…

MALICIOUS

PDF

96.2 KB Created: 2021-09-07 12:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: bbeedb9cb764c391e89ff87a6fb499b0 SHA-1: 786642c3ca87b77bb2ffc0d41ed3951459461397 SHA-256: 2cc50f1d91aad840085bda07b1eea300a7999841cf6c9347d66edcf53de91a8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://misosmile.com/upload/editor/files/53449288592.pdf In PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/c64c8c292583c464cd882161678fea4e/34496694749.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec9bfc7ea3---46556863695.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa590116b95---63913762561.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/d11711023f2d59bbf025b3301bd776d5/85652873015.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210801155051114.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/41b59c6a986746cbfe8692a2fc93acc4/51145265334.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/5fc7d138c4ffc458b9991e41c648ebba/nekibanoluxadureruzizufu.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/99755221019.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c64c65fe0---pasiziz.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110f5c2b4c5b---zidobi.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a791793872b---fikipetem.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/e439d2d52a10327518cf0587e02cda77/fedeveposubozexewixepoj.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161254d0649e30---12321329316.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160808ba0338f4---6462963372.pdfIn PDF document text
    • https://luminex.pl/upload/file/24340757559.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d826ed2934e---wadugivop.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/xopokawenu.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/3867122831.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/d9c36ca9105dcba478f504b3821cf562/pekarawux.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/kojovijilalopagimu.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/sorevikidal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=texas+workforce+commission+appeals+manualPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/vokumujojugefetav.pdfIn PDF document text
    • 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_off00011152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11152 18476 bytes
SHA-256: 36930fad4b94f4cda36826e1d6a1c93c9b104eef4c55d2876379d13f28486381
font_01_sfnt_off000141c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C2 10884 bytes
SHA-256: 46d848dc07668382fdcda408bb141bdf529d17e108a239e21353e94b2e5d1708
font_02_sfnt_off00015aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1