Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab6e833f939fe207…

MALICIOUS

PDF

78.3 KB Created: 2021-09-10 23:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 42882910e3f64311b4993740b47b4969 SHA-1: d21a62e8f80bf9372d02a37b51e969c50c0e823f SHA-256: ab6e833f939fe2072a09a1911912bfedbf45e47e81186b4688f934bd326610bf
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics indicate an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=my+play+store+is+not+downloading PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b66fb107a9---gexuwoxezitokafivawab.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/34176942802.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210909171344754671kx9gglgtrm53.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b9bcb8c01---famidaxixopusepozize.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/90339677899.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/83532782657.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/revurutupifom.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/92537690870.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/jifuzakesaladaretuvuma.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/83974685318.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/40380470592.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/lu44a28n0h1srpcf31g3usnoal/fozivivej.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/fikekolosulepol.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/13985752667.pdfIn PDF document text
    • https://ntc-container.com/upload/files/wufetiwuvikoj.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e98fe852d0---21541250756.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/21376558510.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/67985514128.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/mogirizefipomefib.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/vevunimamupupa.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/77449449008.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/lulovobexaw.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/59889267005.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/vipekebabomasaziwaf.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

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_off0000d010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD010 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE822 16704 bytes
SHA-256: 55720d8090dd79ee32b7ed8818537fa3628575c2f34e4441fdaf525ff09c4be1
font_02_sfnt_off00011291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11291 10760 bytes
SHA-256: a69689e43282f9d77fdc116faae5a19d20cf22b40b773c26c7c21167a53563ef

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