Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c7e7cc52bc01b04…

MALICIOUS

PDF

79.9 KB Created: 2021-08-26 21:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d8bac5f7a957419fa3b5c0b92e8e9201 SHA-1: 9caca0516a96204e41f625d9b230fbdbecffd36a SHA-256: 2c7e7cc52bc01b0494e0cb577c506a3244d9ce2e8d41d59ffd980f3ced9424a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, suggesting a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/qlehh8om480htumiq6u1lncvl8/59084669898.pdf
    • http://zimmerei-possert.at/70011924233.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16089850193e28---punosemuz.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/f1a6e097ddba9712a96d81e3dbb09fdd/34603786736.pdf
    • http://biolabsrl.org/userfiles/files/44695986669.pdf
    • https://asset-books.com/userfiles/file/89514255441.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da403128432---74372584327.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/0acd7c24015e5e8c5c0f59d5dcf79641/bozogopovuvefe.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d49c4849884---3402959123.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cc4d03e8931---29323202626.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6f0b06b54---degodag.pdf
    • http://digifast.cz/userfiles/32063117345.pdf
    • https://kajariaadsevents.com/admin/uploads/file/19151262857.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62521989f8---walupanovifarusi.pdf
    • http://dokturmice.com/ckfinder/userfiles/files/61408298086.pdf
    • https://abofahed.com/userfiles/file/49151018914.pdf
    • http://dachastyle.com/userfiles/file/21847054065.pdf
    • https://office-agglo-larochelle.fr/userfiles/file/722120910.pdf
    • http://haciogullari.com/depo/sayfaresim/file/mumaruwajazebekikox.pdf
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/mimenipijerosaroj.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1vrndfh627he4gp7j7e7f76qq0/xekosafopo.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/uhq6tht1i694m2v2gh577fkhj4/5534076747.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778ae3ef127---26100995828.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=color+pdf+to+black+and+white+pdf+online
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5eb.bin
41419cc57c935bef666e2de721f8cf322aa3f2ba485fb5365b76c9553e303d11
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EB 10896 bytes
font_01_sfnt_off0000eeeb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEB 16792 bytes
font_02_sfnt_off000106fd.bin
f9fd664815e41afe1fcc2c29a4c93dbf99bd481e58642d9be908070edd71e288
pdf-font-stream PDF embedded font (sfnt) at offset 0x106FD 16780 bytes