Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3946336a55fbf2…

MALICIOUS

PDF

88.8 KB Created: 2021-07-03 00:30:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a38b7765625927efa73666f11cdb2f7 SHA-1: 91b70554efbc4a64502ecba1febf3f3e0b44e40e SHA-256: cf3946336a55fbf21597ba2ecd9051204b1cc7e1b1bb8fd7669ad7453bbc44be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://laborke.ru/uplcv?utm_term=spinal+cord+coccyx
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160740b1f3a898---lizejanumenuwemin.pdf
    • https://laplacedesstores.com/upload/file/mogeje.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817f9b8a6fd---43721531717.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/taooplts7td9l81lesm1djqsek/gatitiruf.pdf
    • http://goksirkrupskimlyn.pl/img/upload/files/96070648292.pdf
    • http://www.jindatunnel.com/up_files/file/27523888338.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c871aa33f77---89488413953.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1608581c2729c4---2794522925.pdf
    • http://somsit.com/ckfinder/userfiles/files/fefelejaloxuja.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2624ed156---jetekumujojuxodenatefal.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/sglonun5h1s7hhs1iifajuhvbu/vanilolirataderoz.pdf
    • http://ahsaipu.com/v15/Upload/file/20214291651373932.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607004635e439---18368594752.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160816a61cfe78---mobokuji.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/5l9e4urv2resdeaqm5mqo98ls3/limamowed.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a66602b54c4---senubamobegetifafonukat.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d01369e4a4---pebawamigep.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/se3rrbvo430uhgo998lfbpr5m1/kaxerera.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1a7763ea5b144af5f560dd6ed78e79b0/52325722265.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/948989a1sl4ms2pbe73ab3qu9o/48840362023.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/gon4a8or88i6uu941t53i2go8b/33900585401.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/gd15bin8f34sk9n82udp4mjael/lozozarotapidivoleke.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/b1a2ff125e0e7709218bd79f8783c232/64453554926.pdf
    • https://hanyauntuktesting.com/contents//files/66224285464.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/5843d1043cc9341ba2388ace5a55755a/fekujobozojudezupigure.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_off0000f9c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C5 16792 bytes
font_01_sfnt_off000111d7.bin
b060bde2700b67086e9beb9171d9c14444633df5bd6533e539a12313f7659ba9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111D7 17180 bytes
font_02_sfnt_off00013e4a.bin
efbe149895ee720e40f857d6ec3d0dc458d34e2d9cb8a4f4317d40e6f40cc2fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E4A 10400 bytes

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