Malicious PDF — malware analysis report

Static analysis result for SHA-256 a147b4825444d895…

MALICIOUS

PDF

69.7 KB Created: 2021-09-21 07:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: edc7505b58cb8b90323d98387b4f6bd3 SHA-1: 8ff82541aa76d65c64df65129b1e229b1ede69bf SHA-256: a147b4825444d8952dda3ccc98ba59a183e534b1f01e4344e81fbbbe6c7a3218
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1598.002 URL/Domain Information: Link Tool T1598.003 URL/Domain Information: Phishing For Information

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing and potential social engineering attack. It functions as a link farm, directing users to numerous external URLs, some hosted on compromised WordPress sites, likely to facilitate phishing or malware distribution. The presence of a 'callback lure' heuristic suggests an attempt to trick users into calling a fraudulent support number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • 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.
  • 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://crewmak.ru/uplcv?utm_term=game+of+thrones+season+8+episode+2+123movies PDF link annotation
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/gefufelolowenakal.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614080f8de068---pupizotiw.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/56584639617.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/37817114667.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3b7f5acd5---romaxapobisojumekewof.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/25734785843.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/sojogokokasitumej.pdfIn PDF document text
    • http://tchid.net/userfiles/file/bebowamijamujekopirudep.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/gopofagivukiv.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/60145053424.pdfIn PDF document text
    • http://wjcopy.com/upload/files/39256053918.pdfIn PDF document text
    • https://promise-land.com/upload/file/gekovavijigasumutemoku.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/75071317274.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/2ddb720249b62fc6546b6085b7e2f48c/65939018003.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/zoxagelebujofeteve.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///66259291678.pdfIn PDF document text
    • https://polandpools.com/contents/files/44934696696.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/bafuzifufuromitowima.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/40943836836.pdfIn PDF document text
    • http://metallpress.ru/files/fedegogoledaredaputoka.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/67586894444.pdfIn PDF document text
    • http://sieuthibds.net/images/files/40318393899.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_off0000b016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB016 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82D 11372 bytes
SHA-256: a6b12d594f8926ade0ccdf6e9f2830b54f95a70773aaf31d84ede4ee39bb6e06
font_02_sfnt_off0000e2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EC 15064 bytes
SHA-256: 9395ebff4dac5ede20dc5c178c52791c5b3ce2f9bff26e355553d94c2a94346b

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