Malicious PDF — malware analysis report

Static analysis result for SHA-256 35fe9a7d5daaf34d…

MALICIOUS

PDF

80.2 KB Created: 2021-09-05 14:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6050f00a8104cfe29ba1feb7a3422e4f SHA-1: 1a8a99e4d5f2b051a6d360fde9cf10e89e65df45 SHA-256: 35fe9a7d5daaf34d87b5fd7d0ee6b8cbb56df13ab3a55760e6b37b509b005314
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 CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://herningbadintra.dk/app/webroot/upload/files/49369348787.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8cf3622814---24380260964.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/fdf62ef624a7ee9265f6fb237365a685/42335337595.pdf
    • http://romangruszecki.com/uploaded/file/10327955376.pdf
    • http://littlepearlbooks.in/data/eimages/file/pubusuvu.pdf
    • https://greenlakepaint.com/ckfinder/userfiles/files/42244844176.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/e7ff4b290d1e1f474c96e9c676094970/bametatonirixuti.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/22e7ac88072d8c5ede67667f3150d776/babudurevaxepebitepeveti.pdf
    • http://moretonassets.net/userfiles/73204203009.pdf
    • https://sunarchegypt.com/userfiles/file/57534914524.pdf
    • https://mk-promotions.com/ckfinder/userfiles/files/rojitosefedeludume.pdf
    • https://nestsearch.in/admin/uploads/file/rebumuguvijuvin.pdf
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/dibojedudepata.pdf
    • https://ksboutlet.com/file/files/wudikibimadedipife.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f32f264eb---47642793710.pdf
    • http://www.solarwindependence.com/ckfinder/userfiles/files/13791732876.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d636b9f837---42225460960.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27eaa5d0cd---66274120598.pdf
    • https://cremyco.com/app/webroot/docs/file/sujotafepudizitejitomod.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090470a234d8---22963402304.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609477f5b17eb---17389731735.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e4cf6e970---dakidesijobixamanixaxidab.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caaace82df2---87725086908.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d1b4d5c5b---74440392291.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/kmqjrast73374q02978c6malup/87531693835.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=preposition+of+place+with+pictures+worksheets+pdf
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/8c8712cd1907097e24d1a27295d6a59a/51293502503.pdf
    • 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_off0000d242.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD242 16792 bytes
font_01_sfnt_off0000ea54.bin
a08ac578661cc6cf4dd355230990a82f6193069db9656df2cac518a8cf31ae2d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA54 18156 bytes
font_02_sfnt_off0001195a.bin
9fe0da28b5e56d15a70ce36a6357508e26b7623dae71184c3467c16505ff267e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1195A 10996 bytes