Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c77af7835590530…

MALICIOUS

PDF

68.9 KB Created: 2021-09-26 08:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7b83a049786b2a5f804e2f63704e56ec SHA-1: dc67c51de6b1e465ffcea5481568cca2fe8349d2 SHA-256: 8c77af78355905303fd5ee77d923ed9220c68e646054150e0e5dcf135a5bfaa9
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous links to compromised WordPress sites, suggesting it is designed to deliver a malicious payload or redirect users to a phishing site. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, a common tactic in tech-support scams or callback phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/837f8aa7d58b605e8df718c9e17b5bda/74896760090.pdf In PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d1b8d2b3d---deniluzugosurujikulowe.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/23217430819.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/fikagidebaduzef.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/tulox.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/17701303656.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/gudiditomopelefijedosaga.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/65214360447.pdfIn PDF document text
    • https://chptravel.ir/data/file/zuzupisawixadodojuvun.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/39288466395.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/noluvagakavufufoma.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/7ec42cd2cca15ee3407f733a8d2fa6fd/sasubudimozabitido.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/50185633201.pdfIn PDF document text
    • http://forestheightsgarden.com/ckupload/files/28108678171.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/689177217.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/jiwozuge.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/49020006335.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/6130719403.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/mozijulon.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/66273032341.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/43113998438.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/vufiwezinavupaladi.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6c77ea77d4846d7edbe0470489db512d/beriborikizolotefenutivuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=python+crash+course+pdf+2nd+editionPDF 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_off0000aedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEDD 11004 bytes
SHA-256: 1fea9cbe23a0983f35bc62f51070bd5248879fa57b8ec2ba7d7ef9b7591b138b
font_01_sfnt_off0000c884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC884 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE096 14960 bytes
SHA-256: 0cbb80e73796454c1cd8192dd48dd134986e75f79f8fbc9485b945ea2ce21e03

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