Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0864e455ac0fcb1…

MALICIOUS

PDF

74.3 KB Created: 2021-09-07 06:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 82e070ff9ef38d88b8c304a3fefaf522 SHA-1: 6d5dc1401dd8e78b233fa78abeec72fa7ce803bb SHA-256: d0864e455ac0fcb1ef39500fb4195e9b68ef0001303fbf44c493dfa2e10e6ce3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with critical heuristics indicating it's a phishing trojan. It contains embedded JavaScript, which is often used to execute malicious actions or redirect users. The PDF also functions as a link farm, pointing to multiple unknown URLs hosted on various domains, some of which appear to be compromised WordPress sites, increasing the likelihood of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://interiorconsignments.com/media/file/96903449459.pdf In PDF document text
    • http://cuatro-pr.org/sites/default/files/file/60647611625.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/rivuzinefigosefagerig.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210627110041752.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070329215906---jajijeso.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/rumanenasatabopezimizelo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa4bda155c---59227871142.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/31933237920.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/36069911447.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/17068689321.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/kujika.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/25c6e1a6e9844f3cd3546e55f60affd0/pifavipafatanefipimamamul.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/46077042788.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/11166252906.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3060a3120---89497312828.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/81948570111.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/7be5e76ab75d97a74c7911dac86142bd/81965322813.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed436bd676---paxepevubo.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/86971906885.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210825065714.pdfIn PDF document text
    • https://senhewood.com/d/files/tawosapuxom.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/wekaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=free+operant+preference+assessment+pdfPDF 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_off0000c142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC142 10620 bytes
SHA-256: 13e64a3b784437fca7baef5ff7663195f2742cf48f96de37ec1f2e4e0297725b
font_01_sfnt_off0000d983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD983 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF195 16244 bytes
SHA-256: a9f9f6c3574ab67bf7318bf82b9d91060d19c95fdfe6cf78bdd0a52efa3074e2

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