Malicious PDF — malware analysis report

Static analysis result for SHA-256 556dfdd07af61b2d…

MALICIOUS

PDF

76.7 KB Created: 2021-08-28 01:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f9c2b4aaf56d8935c3ee607f50109493 SHA-1: 6e06798b11fecfa890b2af9188f4ea3c75f96339 SHA-256: 556dfdd07af61b2d034063c0073fa030e7e287d570855e60d2a9c9c680ff8016
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de2ec0dc8a7---bisafazagososemixire.pdf In PDF document text
    • http://j1medical.com/uploaded/file/sewetoxabi.pdfIn PDF document text
    • http://helpibr.org/clients/f/fe/feaff840d005acecac0f151e8679c8db/File/mapixinomukozi.pdfIn PDF document text
    • http://teakdeck.pl/files/file/xofawozadepep.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16095c54942d8c---digiregotiwabas.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/b4948fadd0ec91191a0bea1bd080d306/nojepodepuvopodave.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b752566f2a---88799245832.pdfIn PDF document text
    • http://bethanybaptistcolumbus.org/clients/75549/File/javonoxumumiremijil.pdfIn PDF document text
    • http://gakuso.jp/image/_ckimage_file/xijuzewagibidusivovebosib.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/58272449666.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/58553776949.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612508e8284e0---pukag.pdfIn PDF document text
    • https://area5srl.itfile/dugadixojofexuwadajed.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__60FF614FD4D65.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610dbd31f1967---30363894277.pdfIn PDF document text
    • http://thongthien.vn/upload/files/tibasemerexagosefaf.pdfIn PDF document text
    • http://citra.cl/userfiles/file/72969141131.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607a35c3ada43---zivafavuvitan.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/riviziwugujasilekomelaxuk.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161256b3b0692b---sokulujafitonadipaj.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/mepokavumusiwaxasegi.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/balafexolemesona.pdfIn PDF document text
    • https://mzlpro.com/web/img/podborky/files/gufuwawepori.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717a202c5d5---ziganavesimixuwisozebired.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/pexew.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210619_971EDB26B2300104.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=shevat+meaning+in+hebrewPDF 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_off0000c6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AF 17280 bytes
SHA-256: 1d66f7fe85d45628f931351cfe77787725a67d5cc9044e24bbd019369a8a68dd
font_01_sfnt_off0000f3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A7 10588 bytes
SHA-256: 4fb35db371390266ac520a7a87f8b138092a94bd3ee5f738dd059f426d9aff25
font_02_sfnt_off00010bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1