Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e596f82b16d9df1…

MALICIOUS

PDF

120.6 KB Created: 2021-08-08 01:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 110a074cb1ad38a0948972de9ff92a29 SHA-1: dee47196b803abaa95a7636ee9e3dc4c55eef986 SHA-256: 1e596f82b16d9df13039cb610248037c3eb42e5d4bf08231425a28dcb98dbdad
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal Application Data

This PDF document is identified as malicious by multiple heuristics, including ML classification and ClamAV detection, specifically flagging it as a phishing or trojan. The 'SE_MFA_LURE' heuristic indicates the document is designed to harvest credentials or session tokens by mimicking multi-factor authentication prompts. Numerous embedded URLs point to compromised CMS uploads and link farms, suggesting a distribution mechanism for phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/h8n2os8jt9spmh4gg7ji9jm1li/labepo.pdf In PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f8dba85c629---35215158476.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/mulirejojusaval.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16072d3b59c748---51054029790.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084e754a8f53---xiwino.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/48739890059.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2da8f4c543---82191413756.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1e42dff4b---21256502693.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a4ff45d21---6460792405.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d3702a66143---legatorogikibeteg.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/53590307130.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/k3n3rbvgb3h6rme6bnrihpbtf1/lirelajikevobelineli.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/6658438451.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/bc5626bd8f39d3476722ab377949d293/35297328444.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/57272855965.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/6g4csvqdc7fjmgehrlfq9avrt2/64539418038.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d13db891de---31582821408.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/5a1aae5bcce9a85825716c01b3a1fe45/75195643803.pdfIn PDF document text
    • https://sapporopools.com/contents//files/81969049358.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/dujekosaregeduvoteji.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/lasilimadimeluxalixe.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/b5b85fc2aaa7497bace91a166c021873/weguvijujuwavetur.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af9638b9df---kefonilovoxijetovuwixosa.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/mipifowubowewexekomok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=black+desert+duo+grind+spotsPDF 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_off0001729b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1729B 17688 bytes
SHA-256: e2ac80dd0d08bda24a334b3acb67f5fc27c5c901c26c5950df8ee7fb2746a173
font_01_sfnt_off0001a0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B903 10936 bytes
SHA-256: 52b73ac9c8e93c7e50c52f6290422c5c914ae68ddfcfa06b09ed9332a4c04737

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