Malicious PDF — malware analysis report

Static analysis result for SHA-256 f500c29a3eb3df01…

MALICIOUS

PDF

102.3 KB Created: 2021-08-14 19:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3d9c16323ff19d74c0553368d35f1309 SHA-1: 42a5902c32eb3448ee5954604e47b82e2461bc6c SHA-256: f500c29a3eb3df01795650f26efbcc963e338737916dc74e476734f75a2b6c43
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and other disposable hosting. This suggests the document's primary purpose is to act as a link farm, likely to distribute further malware or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, aligning with a phishing or trojan delivery pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://orem.mn/uploads/files/41670578018.pdf In PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/3c47a05ec0da646f8749a00ad6e80afd/53466229368.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fad603e022f---jedodokid.pdfIn PDF document text
    • http://worldwidefilipinoalliance.com/uploadedFiles/files/96367426431.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/makabofepedimuzamojifeti.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/e5a333984a1f12d5361edeeb39c1ba68/zuvuvuxabule.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/21m1tsuskqp8n2uri7otd6qqtn/67839351337.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe27e470b0---pezip.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/9f3c83a66e0e0c031a596c72cab67ad5/nigeli.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/90081232844.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/2402950397.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/50863083907.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/32487769527.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/migiwoxepirasim.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/kegofev.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160851b78724ad---vovuxawadologufejevub.pdfIn PDF document text
    • http://khunghinhdepphuctin.com/media/ftp/file/padikirufewi.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/fc17451ae7163ddf9049093eb21b753e/vowifikubopifajasizov.pdfIn PDF document text
    • http://recrute.fr/files/files/suzusasolifu.pdfIn PDF document text
    • https://educhina.mn/editor/files/kokematuxoritoga.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/17618925141.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/94223671307.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a56551949e9---degomupofadamibut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=legendary+game+of+heroes+relic+guidePDF 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_off00012abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABD 17852 bytes
SHA-256: 6fa0f97b62aa40185464da388813631256d58ea1c881f06a4761067d18cef46e
font_01_sfnt_off0001595f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1595F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17176 10996 bytes
SHA-256: 5fd57f7f60d897adfb0a8758abd99215980518bfd9f8c441a70b266ec5828f46

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