Malicious PDF — malware analysis report

Static analysis result for SHA-256 c844343a5d006dbc…

MALICIOUS

PDF

83.4 KB Created: 2021-09-17 11:27:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1154fa8d4349bddcfc9fae99890f5f80 SHA-1: b0f58f3adf60e50272131d3b791fb64b69e81a54 SHA-256: c844343a5d006dbc7a3a45b4acfdd686140bb7bf2ea5c1c2da84adc1c9c898e6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Harvest Session Tokens

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or credential harvesting attempt. The heuristic 'SE_MFA_LURE' strongly suggests the document is designed to trick users into providing one-time codes or MFA approvals, likely to steal session tokens. The numerous embedded URLs point to various disposable hosting sites and compromised CMS uploads, characteristic of phishing infrastructure. Although no scripts were explicitly extracted, the PDF format can embed JavaScript, which could be used to facilitate the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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://nomylo.ru/uplcv?utm_term=how+get+free+uc PDF link annotation
    • http://tolltisztitas.eu/userfiles/files/6166228994.pdfIn PDF document text
    • https://comfort8889.com/upload/files/51351798360.pdfIn PDF document text
    • http://riviera.az/userfiles/file/41442108026.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/4d290ffe63dd0eac30f8807c69ec0853/pujakubijizaxevi.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/xobonuvututuriworo.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/9ed442bafc2a96d8e8374d9580c9c077/sobirurawerimiwata.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/pajuvulinuk.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/71923448075.pdfIn PDF document text
    • https://kratky.eu/files/file/55185416212.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/zasepoxirepalowi.pdfIn PDF document text
    • https://ever-progress.com/upload/files/82344170539.pdfIn PDF document text
    • https://interconformity.ro/images/file/63859763805.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/fodiwunux.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/28508785823.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/31165109736.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/zewinak.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/manodelemutivu.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/luripuxaxo.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zaruped.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613272f5371b1---rozudavegigafatuluf.pdfIn PDF document text
    • https://kaparatt.com/images/File/3147392536.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/92636863969.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/d0e6996425d90c1be97d08da908818df/bilalunu.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_off0000e2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D1 10116 bytes
SHA-256: e625d0954691ab06871da485923f502e4eb09225b4d7b6f6bb764e4befb2ca02
font_01_sfnt_off0000f997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF997 18204 bytes
SHA-256: 7b21854b8ef65d0950b82fd51bfa0800cc364d2bb056a3b30f0a1a7bb2319d12
font_02_sfnt_off00012887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12887 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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