Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f1374db1221183…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 17:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 722a93b061ec994f2376960d1c2a5943 SHA-1: 8991f0e77405bc5db5feea25fe4b9205b7119185 SHA-256: 33f1374db12211834d0844195d663371566db91045c559d8c40f0f465f39a5de
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to obscure the true destination. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests these links are intended to manipulate search engine results or distribute malicious content. The presence of external URIs and link farms points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://dlastudenta.org/Upload/file/57069128144.pdf In PDF document text
    • http://spokoino.ru/i/upload/files/fubilozaxiralojefug.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/92032555014.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/77878053426.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/49370912832.pdfIn PDF document text
    • https://partnermind.cz/images/files/rexitajogulumus.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/41815156351.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/4644293083.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb25292710---75901878716.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/27912074844.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/bokudesupuzuvaguke.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/povelofeweraziwozijeb.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/62879096213.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e19c81207---61522318692.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132ecf655de6---89112409157.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/96745675988.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134e30933c00---setel.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/munetujixudutesuzilatis.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/19739140586.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/657b7f2b556bfdae7d5469813341eaf5/dimix.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/kukevunivukupojorosa.pdfIn PDF document text
    • https://loyallcanada.com/editor_files/file/zudafam.pdfIn PDF document text
    • http://computerdoki.hu/user/file/24237817938.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=play+cards+ioPDF 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_off0000db15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF327 18360 bytes
SHA-256: 7a58ffc49f62405a854872a12f3afcfebd875a315e681175be79216b20d100ea
font_02_sfnt_off0001232d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232D 10144 bytes
SHA-256: 0ed974989877ebb306b209c2f1bb651a669506c11d4dc9bb8e5be213cec51da3

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