Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8f63cbda6dd98c…

MALICIOUS

PDF

98.8 KB Created: 2021-08-17 06:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9f2691f267acd0e7de333dfaa5fd36b6 SHA-1: 538ac7af0bbba2a488ddf43c2d4013b7418d177b SHA-256: 5d8f63cbda6dd98cb980568298ed123f25100b96a642141b35429fdd20566a34
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. The embedded URLs and the nature of the link farm suggest a phishing or malware distribution scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://medvor.ru/uplcv?utm_term=world%27s+weirdest+animal+facts PDF link annotation
    • http://coreaad.com/DreamDataUpload/file/zisabobedaduxevolezizipu.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16084137c76f76---kofaforizuxelixo.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/72163521881.pdfIn PDF document text
    • http://elma1.ru/!upload/files/bibafejaxik.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/rofamololibetojexotuwulu.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210803_02D167ABE422D9FE.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/86312944603.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a67a099c55d---nixelusob.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/12079748529.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bc39543de8---jufudejijun.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36755261355.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9639a9b6a---34906320868.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/250311593198.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/tewuxabevinilofog.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/638b0ce9db1bf76b072a029aa0074f95/zanivejalujovo.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/vegipedejarafido.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160759433bdc89---67999329092.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/gunedupobowupu.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/retitewurire.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608253a55fbb4---jivedaribepad.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c732a30a005---20975970625.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831df512e32---22074506365.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/foxobamosijegonufaritu.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/mitasaxesog.pdfIn PDF document text
    • http://catgarner.com/clients/873270/File/82028858429.pdfIn PDF document text
    • 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_off00011fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFF 17080 bytes
SHA-256: cc6dc7b55d537a877d43e8e503acb05f8d4f902fe8e4350c7289cbef8ef7318e
font_01_sfnt_off00014c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16477 10752 bytes
SHA-256: 6033a2cbe3ba3f85107c8f3bc1132c6b539b583f0c27b235a1b29d1745c8108f