Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c95a1884f6e82bb…

MALICIOUS

PDF

75.1 KB Created: 2021-09-19 03:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: eb203d3d5bcac8fb6e6102ea891431a3 SHA-1: d065827f82ef171e6b6f02c3c0e37c6eb5ffd469 SHA-256: 0c95a1884f6e82bb2f04aded99fe09c0f4ecdc0d2f636a2f394169a87bba3a38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that lead to external sites, some of which are hosted on compromised WordPress installations or disposable domains. The presence of these links suggests the document is designed to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pistant.ru/uplcv?utm_term=j5+sd+card+slot PDF link annotation
    • http://vinaktv.com/storage/ckfinder/files/ruwuvifoxizojiza.pdfIn PDF document text
    • http://i-physiology.ru/upload/ligepipudipozujepojizule.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16146718f35439---nolaxixonowimiwupivukuro.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/zeresorujebozowutezi.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/58409924317.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/127228669.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/bizutud.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/425539ba3372c44e4f341751704d6178/magiguvudu.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/79721241818.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/9352228791.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/14807843382.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/kolotafezubibemu.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/c348509c0213838f84eb558c42f72ba2/33481324059.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/86901570931.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/56611377919.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/xokukefila.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_off0000c404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC404 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC16 17048 bytes
SHA-256: af3fd301ab7178d440265f916c00fc1307b86b8241a7862285648dc5c269f3c3
font_02_sfnt_off000108ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AC 10160 bytes
SHA-256: cf5b7b1e9fe91b8e1c5c1f70cfceaf2f7254003a032666b20847023fa09af687

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