Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b716e0e0dd281f…

MALICIOUS

PDF

95.2 KB Created: 2021-07-18 14:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: d40b328e88ceb4d3993603e0d5d6f022 SHA-1: 36435539947e875f76f89f6c5db5edf6d0ae63b5 SHA-256: d1b716e0e0dd281fb7a1d2296dd6d503959f83a9b80e214f9ccdc1445f1cefe2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that has been flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised WordPress upload directories. The ML classifier also strongly suggests maliciousness. While no scripts were explicitly extracted, the nature of the link farm suggests it is part of a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9ebfeb3cf---81082657539.pdf In PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b56414f5c---xivemivijukatubikanutovob.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/ccfb2028970d99104ebea8cb8e41be38/15815747250.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/muguzesafuvemuwogapifad.pdfIn PDF document text
    • http://artospace.com/pics/file/fuboduvoxenipepi.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/72491588036.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/buvafovadelosonigutiwinif.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/ec7574a45766556fd7637a04a107d628/13773983431.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/fukodalidesalivomaxurub.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3ea29443064bb46b2da02405f77eef99/73472420718.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/avde1mee03soudi14agtjoufa4/nigigojapoxaxozozepapoji.pdfIn PDF document text
    • http://crm333.com/documentos/file/31357607995.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080292d40076---misem.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098b4b960514---93173658911.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/09686db8df524cf72172b31c857c6160/95556957686.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/51b968c7a5328d7334470b5ddf14ea20/1349264245.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/r8a21gvnpelc7bnmccenpsrdqm/tilujove.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b05cb092b1---90703503069.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c598ad17fc1---zifijujaxupuxidewara.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/55844520811.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/lajupudumefugafabejomabig.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/lerimivafulalufimometaso.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/72996884484.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/vuzagediwalu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=gratitude+and+well+beingPDF 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_off00010e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E76 18312 bytes
SHA-256: 39318c2676ddcbb32560995d0d21c8bc33fd4617dfb4d9aa84591bc0e5fb837d
font_01_sfnt_off00013e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E68 10500 bytes
SHA-256: 3574c2f449d62246e2f5b0d3811cda07a04ca51777f009e727f4da196bca4f1d
font_02_sfnt_off0001563d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1563D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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