Malicious PDF — malware analysis report

Static analysis result for SHA-256 56989ad689ab9753…

MALICIOUS

PDF

110.2 KB Created: 2021-09-01 23:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a1fcd1ab8f7157cad473f5d9c0526ea5 SHA-1: 21cd26ecbdb68867f3932e2397613050092e1afc SHA-256: 56989ad689ab9753665ab6a21ddbaa3487d31bf8eea2e403795260fe64718df4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to potentially compromised WordPress sites hosting further PDF documents. The primary attack pattern involves luring users to these external sites, likely for credential harvesting or to deliver additional malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/0f7rk8svm07ll29jk1ra6sa0o2/zevolefifavofizerib.pdf In PDF document text
    • https://camgloberealtor.com/userfiles/file/45371021829.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/14ovkm5tj17mnpa5u4kf84jt8i/20999700492.pdfIn PDF document text
    • http://qzgj.cn/upload/file/zabukiwidewalu.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b7114d0db---87229714139.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/64720613027.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///22772815688.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///74943495126.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/74955646790.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/98148468764.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/29298034377.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb22e4046e---8677094595.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/66017876956.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/5da3ec1f8ae6a2c95c54b386dbd01ebc/wirazedosobezixiwenov.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/ce6f9292672ba8700969cbc502f551b3/51864497700.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/a2c5c9794194bf100977e8338b58b2fd/kupobiputalofaxufin.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1611dde1b40cea---26652159022.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/bobunotufugede.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/fce8945b44279db3cfca7f39ba23371b/varej.pdfIn PDF document text
    • https://isuzuphonoi.com/data/dulieu/files/vaduxoxixesugozufux.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/82273876467.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/32a764025b7ebb6d09136b43a97d3afb/75410117690.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a64e339cf94---wovotaxag.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/ravuxowe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=map+of+greek+empire+after+alexanderPDF 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_off0001468a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1468A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EA1 10860 bytes
SHA-256: 95ead5efd1b8bda76ed6242ab57b6b2fe2901501c618039aa21611c4cc92bd9a
font_02_sfnt_off00017780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17780 20068 bytes
SHA-256: 1457ef9a1dcbb3d1c0dd588fa1c1058eb33c75270a0ebeee2cebc35482c1e65e

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