Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b50640e0a910db…

MALICIOUS

PDF

102.9 KB Created: 2021-07-08 11:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 68e8a78c1503768b444ff43b1f1a40be SHA-1: 4beabe8b5c9d988b6ee8b199416a1fe292db3425 SHA-256: c4b50640e0a910db3ce916f47670a8dd4257db0278e85b8b75ff466d8717be61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to websites hosted on compromised WordPress installations, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL targets are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4bc03e9d2---disunetamiz.pdf In PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/37412def179e52ab9acba5b7aeb24a18/62490752043.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/pejin40dlieqlrbde2s4b9ul83/24062549659.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608889055a08e---wojavonejazubenumidawi.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/b1e11td9vmkd2a3r0trkinfg2o/88921931187.pdfIn PDF document text
    • http://hotelstrack.com/bot/ckfinder/uf/files/lezewixefedotojamuvalas.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609747811048d---48428200310.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608120f62656e---vedunujok.pdfIn PDF document text
    • https://blogsma.com/files/vitubej.pdfIn PDF document text
    • https://oversaslogistica.it/file/wepasu.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/01f61988fe1ccf45a0161230fe30eb88/zetararijonobubofome.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/71497467344.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/noa4rgid34700glvg3phdpl20m/13128361275.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/wivavafomiriralixogoxenoz.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d3d543209---tobivoroxovisaxafalidek.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/27883010486.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=logical+thinking+questions+with+answers+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11779 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F90 11280 bytes
SHA-256: 4ca75c24fb26f82d1fefa0bfb091fc39e214b95f0223d175a49171aaeb0a6afc
font_02_sfnt_off00014989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14989 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_03_sfnt_off00015f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F01 18032 bytes
SHA-256: 36053858052c289c6221ba3117c012cc83cb10e1bc677b95e0e1b26718801c88