Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd3dcd27a32fcae3…

MALICIOUS

PDF

91.8 KB Created: 2021-06-30 01:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 08e73d3130a7e2e516439a3768f55e27 SHA-1: 4b9a625eaaf6e548e498a881bffd864c0bd1075d SHA-256: fd3dcd27a32fcae3323d94ef10546e623254b92a937b921a590bf4d6c468acef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The presence of embedded URLs and the 'Fake invoice / payment lure' heuristic suggest the document's purpose is to trick users into clicking malicious links, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://nw-line.ru/generic/uploaded/gugiwosatidanamegiba.pdf In PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce7bdcec59---bofoxofuzizawemabix.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/14526ac902e9d92506d7990034d2bc15/70072456981.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/f31c3fb38581587014106e18dab4ac09/kuluf.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/44885eaa1dba05cccb6741bb5f9d6737/dezetokefemako.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/nivemelizev.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609be05c72e52---xifinedef.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210528135533.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/wotopubipejinisopana.pdfIn PDF document text
    • http://katachizu.com/img/news/files/57864065008.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/m6h3t99omd937da2lcl3itr6tq/junizogeruto.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fc9bc27ba---xobag.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/ab71b7b6fbe712f6f71fd5bb65d8d1b8/97828792013.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/32a0950b821f261db19171f69dda1c76/63304687156.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1abfe1cdc---vafejeman.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/wegiviforuvaxekus.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7afb960c60---37577385915.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a772d4991a1---topupagirupozuzegimij.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/vim4laoru8kqi1366nmscl0r5r/94526808450.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/14863742791.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/0b5qtoulbq6ou5k4f76b8j6lk7/66944739414.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a589b9972---rovesofuxosuxobobima.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/5067f0440c2a321b7bac4f543104559e/vifafosawolekifidivinofew.pdfIn PDF document text
    • https://majubesar.net/contents//files/1146914036.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=stipend+for+hosting+exchange+student+taxablePDF 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_off0001008f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008F 17928 bytes
SHA-256: 5fc99f8f44968fefa40d1da561dc8f00d468a1bb3fa6d46f80dbafb299f44439
font_01_sfnt_off00012f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14799 11316 bytes
SHA-256: ab22cc37f89ecffcfa4796a2e309a99a82a1d4b91a54dcf632f37a3aec095f98

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