Malicious PDF — malware analysis report

Static analysis result for SHA-256 be9662fb8c02ea09…

MALICIOUS

PDF

71.8 KB Created: 2021-06-18 21:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e920003e32d16509c0e074f81df394a8 SHA-1: 0696323fb4863991a2a7e4a43ac3072913c04228 SHA-256: be9662fb8c02ea099a73180115ca163ce6842dfdf731b8a0174a6837930494e6
156 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The document body, though truncated, mentions 'Resume in pdf format', reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://infrive.ru/uplcv?utm_term=resume+in+pdf+format PDF link annotation
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16093bb9d60eb3---34381939387.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/fipokelato.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/frdq5qr8drafbijled5rhnbpn7/mizedetefekufomijuxuwuri.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/72039804310.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/5202322079.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/xujibegamozinatuvu.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55588d4132---96615256960.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/71147194183.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/radev.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5f22da830---mixalamanuja.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ln8tjm57lmq1qkef2v5949vp22/60559718943.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/lixanazokujada.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160aab34e61235---11840425534.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_off0000de13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE13 5160 bytes
SHA-256: 2b87064b5a67e4d8355598a34777119291cf3652f8ba8e0137050edf9a011ee5
font_01_sfnt_off0000ef89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF89 10332 bytes
SHA-256: a322bdae01e3f50d1a995318a8a824dc81b03e94b20321c61624177b9fccb646

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