Malicious PDF — malware analysis report

Static analysis result for SHA-256 1efed129911fd641…

MALICIOUS

PDF

60.3 KB Created: 2021-06-21 04:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68038bf37af2be2a0b2f26188117dbd2 SHA-1: 8bcb211131579d39653d5d9caf9ac24f3d036ab4 SHA-256: 1efed129911fd641cd2f40febbbdc7688cf4705057dedde5c165e46d3632ebf4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress sites and disposable hosting, suggesting it's used to redirect users to malicious content. The presence of embedded URLs, even if some are benign, supports the attack pattern of luring users to external sites.

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 http://agiusfuneraldirectors.com/files/file/18819271534.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/d507a9a905b7e7da44165cb0efad552c/takarut.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fee67c77a---japeta.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a611da7e9---neluzipipitijanovo.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16080c30b4dac6---butazupilowes.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99c3d25d1e---sakakuk.pdf
    • https://hasekei.jp/userfiles/file/kesobufosazatena.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/2803b406dbbe415a5ccbd1e7fb70e7bd/15215306830.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160994056a430a---pobutojopixovunob.pdf
    • http://digifast.cz/userfiles/28892956092.pdf
    • http://qytbearing.com/upfile/file/naterub.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c3caca28b---jebuduvidubirufolute.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efc4c64b4e---11313508450.pdf
    • http://tortsurprise.ru/upload/redactor/files/putararosule.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=precalculus+graphical+numerical+algebraic+common+core
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af61.bin
83afffc20b95919628b3d19095ef94cf45287abcd678d4cbda95cb3fa92c7c69		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF61 5488 bytes
font_01_sfnt_off0000c1db.bin
ac442ce146cf5f719e01ff8ced1337285e2eb6b35442b07bc051887435c47296		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DB 9932 bytes

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