Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dcc2ee883582a69…

MALICIOUS

PDF

82.8 KB Created: 2021-09-02 23:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 16b714d5f60010a24669aa84c7695363 SHA-1: 142b45f1d0d321f8b0ae1d0ae57a782e8d46ff14 SHA-256: 1dcc2ee883582a6984c2de19bf578022fa4ced5897a708f1d7f1151bd22efd82
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. It contains a link farm pointing to multiple compromised websites, likely intended to host malicious payloads. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely provides instructions to decrypt a password-protected archive, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://oniceh.ru/uplcv?utm_term=qpdf+remove+signature PDF link annotation
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aacfccb7984---14244571687.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/libaj.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2113a4715---16007114541.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/s40hukf9f3gvod16lknvivaigo/domoxoxikalogozobukef.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/3029dhqkhnfnjdo4kehrj5fke7/30693176856.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/nonuwajinorobutaz.pdfIn PDF document text
    • https://apgr.eu/UserFiles/file/589851930.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/26081833743.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1a4bbc8a7---vozisanexobumal.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/47762226127.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/42qp6dgu2io2mlpvso0fsnl8l4/43136450705.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/27917091740.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/dewifoduvep.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/27408621566.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/kimijefomuxewa.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/g115v8hr44u964be81arde97ml/sofoxolusiwan.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/36217551075.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/dupabosabewewebekibat.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a734b563e4b---41210110002.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/39b8493cf1b024d8c254492a1bc58f2a/nivutud.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/fb9fe1d53cbc899ff3c3593ca103ebfb/36729478531.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/79000594853.pdfIn 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://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_off0000df8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8D 17096 bytes
SHA-256: 3f8377bf1eff9b11aa47d5f2827480b7bd66964e8f0fd27220c733929c78ae50
font_01_sfnt_off00010c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12424 11020 bytes
SHA-256: 95e82b03fb5554d807e6947b307d69b4579b676cbf1a16988659ab5543b3993b

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