Malicious PDF — malware analysis report

Static analysis result for SHA-256 acc731f4fa1cfbba…

MALICIOUS

PDF

86.8 KB Created: 2021-07-02 12:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b7d99504bd757e7be2889c3f908f45a SHA-1: eb5061ed28dd973d0d4f61ac1790e7368ac9fa45 SHA-256: acc731f4fa1cfbba0e28eb68599f4ebc03d8263d7023ca4d0e41a4956d9a3b94
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users. ClamAV and ML classifiers strongly indicate maliciousness, classifying it as a phishing trojan. The presence of numerous links on disposable hosting and compromised WordPress uploads reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876417816e9---20072968104.pdf
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/vunazozumoniwaniref.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b41d82e40a---26119955862.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/8846626e7f4981d55a98df47e2c2f82b/99783003378.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbbe1d77408---48700925234.pdf
    • http://tensoinox.com/userfiles/files/87469087265.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160996ec39172b---keguvowugepabugira.pdf
    • https://giridhareye.org/ckfinder/userfiles/files/63192751971.pdf
    • http://fratellilongoni.com/userfiles/files/tuxezisajitu.pdf
    • https://egf.tw/test2/images/file/nabavidewawovi.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/29a5fac865ee6729c73155dad1742c8b/lasaxemigazetaviwi.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/9179c99c0aa03e13d6e5a1bd960a2ef3/lipanibavanekugam.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/4e4eaae63490c15f8d38b0501e167d4a/xejawewetuloforozun.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1608691a633624---tikidugiguraxuxuropusadep.pdf
    • https://hosvagyok.hu/userfiles/file/belukexelele.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873f6a1903a---92151329994.pdf
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/lofetaxet.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c850182f1---71366804295.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077d6d0742a3---77060102410.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e0ac9f46b---geletobadilape.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=multilingual+typesetting+services
    • 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_off0000edf5.bin
45f9913f1265bd30903acd5b1729fba44292f4b731dfa361d8c9508ef0b57921
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF5 18336 bytes
font_01_sfnt_off00011d61.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D61 16792 bytes
font_02_sfnt_off00013578.bin
54a246b5fa2248ec48f219a2c4912b7df08d4f841bce5fa3ee56db415a92607d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13578 10700 bytes