Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cfa5f8d05289042…

MALICIOUS

PDF

60.9 KB Created: 2021-06-21 06:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 2826c0d1271264732da4ac46521073e7 SHA-1: b9b0853f6c7333786cd3eac10f4b5d3ba787db28 SHA-256: 0cfa5f8d05289042ecb424ae5c5847359bd970956b4097b35721ce33daf0636a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains a link farm pointing to numerous domains, some of which are hosted on compromised CMS uploads or appear to be disposable. The document body, though heavily obfuscated, suggests a lure related to educational worksheets, likely intended to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://drafthe.ru/uplcv?utm_term=halves+and+quarters+worksheets+year+2 PDF link annotation
    • http://alnoorcity.com/userfiles/file/vujofowosujewavevonive.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92ea2c7933---netubimilevatevabom.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/fogoniwumokemavepujenuw.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/vobuvojazu.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070d217c643b---vetemis.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/80712169245.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b994d0345a8---setuxezeruram.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/39598562389.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c9368e9fbeb---bigaruxapovus.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/tigawamo.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160afcc7449f07---poneboravipuvonakeruwa.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/junupejegubika.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/vunuviwojisuwi.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/55243455368.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB149 5452 bytes
SHA-256: c89c44791084c9cf1684ed3fb4b2d35e6b023a662f5dc0071810750bdee8dc36
font_01_sfnt_off0000c3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E0 10252 bytes
SHA-256: 661c7d5f0d2864e620e3fbbb5939cabefacbdc74ec2a175ce8bce69c690d7657

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