Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9c7d9f23cb1a5eb…

MALICIOUS

PDF

88.2 KB Created: 2021-07-26 11:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0152f5e6c24c32ce7fdad9f1bd50724c SHA-1: 4dfdba2bb9944c34900a20becc95ff671bfad017 SHA-256: d9c7d9f23cb1a5ebf8b56e24eb410cb8ae2d34b830d9d7dd103c010b7a44b1c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to compromised WordPress sites, specifically within form upload directories, suggesting it's part of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the presence of numerous URLs pointing to potentially malicious content implies a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • 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.
  • 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://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e84b22211f---fimibexexifawelozibake.pdf
    • https://ksuskalology.com/images/file/dejimosomomovu.pdf
    • http://euro-ex.net/images/blog//file/xavepiwizafala.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/464b6c12ad2370442076375b84d8d4cd/75638710952.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec993b2a8a---nazeketose.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c48959e5212---16332771520.pdf
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/pekiwumukuzejizotiderumez.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/89240813471.pdf
    • http://airholic.com/UpFiles/WebEditorFiles/file/gerebekevuj.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/5abcd130b2410a21cd08956a5023327a/bamewikezerawexetenimaxok.pdf
    • http://www.anjhimayath.com/upload/file/61173888734.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/af518154db68a04a8bc2942bb81ec596/zoduruzovonobudemekekamed.pdf
    • https://yingzhaoliuart.com/upload/file/sugopu.pdf
    • http://cjatkinson.com/userimages/71172997114.pdf
    • https://urbanshapes.in/userfiles/file/dofizobudiveler.pdf
    • https://am-system.eu/ckfinder/userfiles/files/darofim.pdf
    • http://mlsy.cz/images/file/files/55151333674.pdf
    • https://biocoils.com/img/file/falizatu.pdf
    • http://hurtmar.pl/Upload/file/69230601902.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/u5lmlkrsfnpv7tc2usbe1q260i/75270308038.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/897b1db00d8b278aa05859c54f523ec0/kesonifika.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/t6dk6gas5907deqva7g46qiv5r/41638589749.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/b70bd9a9c0a00e95fb558883c329c835/luzusijumujulijematuku.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/61b4758aeb83d1fc1666270cd1951cab/nidirubuvuwoxefakulif.pdf
    • https://livre-d-art.com/ckfinder/userfiles/files/porokufiweduwamedip.pdf
    • http://austral-immo.com/userfiles/files/1901247374.pdf
    • http://kurdumovldpr.ru/uploads/files/3043491061.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=bonding+netflix+show+cast
    • 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_off0000f2e3.bin
b244af472a0b907df9ab0f5a8165fbe4831bbbb622cd75b21b5eddf022d57c8d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E3 18144 bytes
font_01_sfnt_off000121cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x121CD 16792 bytes
font_02_sfnt_off000139e4.bin
8827e890b48f019ec407a070d5f5a2e2757c8a890bf665b2dad42489f30ea6b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x139E4 10896 bytes