Malicious PDF — malware analysis report

Static analysis result for SHA-256 7686dbca48f3ba62…

MALICIOUS

PDF

86.3 KB Created: 2021-07-06 02:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: a594ee0b6c1eb8ca93c20ed5579928e2 SHA-1: 326650774150af00d81d854dc82fe38ee4f29142 SHA-256: 7686dbca48f3ba6227b98dc1e974c1370cce7fad37014cb50410c9061643be0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Several URLs extracted from the document point to compromised WordPress sites and other domains, suggesting an attempt to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' reinforces the conclusion that this document is designed to host and distribute links to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/718e5ef5f538e44f1a79ff736ada6272/xijixifulitimemezomaja.pdf In PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/mikizezuviguwuk.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/940054127fbde8124ef2e00c4890fee2/gafeg.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/03a960f612530791a903bacacc5262b6/83563391467.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/pixofiratez.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/71065886839.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/287feeffb26a9ee160a18955a45c8238/tadaruxej.pdfIn PDF document text
    • http://boldogelet.hu/media/lodexafosegirigufetuwamuv.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/20238201073.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/jhhubj15vloke1kasa83q0s1b3/tipuwalobowerivawuma.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/jitugugobulebesubeme.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160724c82a423a---bemumisedefun.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/51202311078.pdfIn PDF document text
    • http://sieuthikhoacaocap.vn/upload/files/93668860294.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0989ba82fc---lomokorogofuda.pdfIn PDF document text
    • https://rosycaffe.com/file/polazugu.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/4689718342.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16081a912cbbce---34110575292.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/mf96v9ied2g5qi00jgeed4h510/33445294421.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072369e07fa3---gojifexujozugufap.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/25241361333.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/voworijufunasakaja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=500+euro+to+inrPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF035 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10847 17360 bytes
SHA-256: 1c8236b6cfcc58ef2ee7554f91c9b14b72b14bbd9fc8f19003446b320481755a
font_02_sfnt_off0001363a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1363A 9984 bytes
SHA-256: 86975d0778916716b3e9f6b8484b4d74a4f6c7ed61a0e5a851c4c49f761275d0

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