Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad8cc14ec8aafc6f…

MALICIOUS

PDF

96.9 KB Created: 2021-10-09 01:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 23ac286244421f16540031d5d7f2fe18 SHA-1: fc1bd023771847b5b5f815b26e13f37dce18d131 SHA-256: ad8cc14ec8aafc6f845bea0b2e6abf165151c7d941200ea2efd14ad23588e662
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is flagged as malicious by ML classifiers and ClamAV, exhibiting characteristics of a callback phishing or tech-support scam. It contains numerous links to external websites, many hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to redirect users. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, but the presence of embedded URLs and the 'SE_CALLBACK_LURE' heuristic strongly indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • 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://pistant.ru/uplcv?utm_term=bully+english+class+1+words PDF link annotation
    • http://quaretti.it/userfiles/files/8324769169.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e64f469422---poxemabuzaxodukuzu.pdfIn PDF document text
    • http://atrsara.ir/resource/files/fomejuzuvegexezap.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/21db16c80d45d3cf3f19bc739ed38e45/jofixinisex.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/fexaxavaxovevoravupevux.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210904172301_749142962.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/27965543439.pdfIn PDF document text
    • https://borsalino.ro/imagini_ws/59946432340.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16155e0fde6132---72483732547.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaf679d678---82574588834.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/62727169594.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/50276082778.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/30683705683.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/xivika.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/xatalupadizugo.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/fetapugodero.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/zarevemijokoverekapapeb.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/3e2deedffd4fad204025fc123b02c066/844238082.pdfIn PDF document text
    • http://abwva.com/uploads/files/sajotiwojerasawim.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/daxodaziwuvatamatisaluga.pdfIn PDF document text
    • https://majubesar.info/contents/files/96852163350.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/72613440785.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/2110452874.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/ximuzaxamuroxukaxi.pdfIn PDF document text
    • http://agrion.org/upload/fichier/47432418869.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_off00011413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11413 18516 bytes
SHA-256: c8264757b9d2fd492d2f09b6d22f74aac5997802b5e8e1a635aac2448654e6a1
font_01_sfnt_off00014456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14456 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C6D 10956 bytes
SHA-256: 40e4edd5355a397e3dc758e7a89c4566f3e414057a86bcf19d7398599dfeff07

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