Malicious PDF — malware analysis report

Static analysis result for SHA-256 140c62a53353d690…

MALICIOUS

PDF

94.4 KB Created: 2021-06-27 15:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: fba59d29f907decfd79beb0ba12192da SHA-1: 1bbddecceb6344d0603af4917c2e9c74eb0d99dd SHA-256: 140c62a53353d69039342453e5b9f08c446cdd13995e24313efc2624b8f04f29
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm for phishing or malware distribution. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, a common tactic in tech-support scams and callback phishing. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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) or Microsoft license-boilerplate 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://ymvii.com/admin/upload/files/bofudijegi.pdf In PDF document text
    • https://alternativecarrepair.com/userfiles/file/puvuna.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/fimebafejigadujovonefow.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210429094923101.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160745faf9a99e---zisodazexapuvop.pdfIn PDF document text
    • http://midel.me/userfiles/file/nixuneluxumewisi.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/tivezusigadepeliwobokuzu.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/4282902649.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/nezokexemowapinunew.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/moxamevuz.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160926e850c61b---55779692727.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c67ac0242e7---93407685312.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607898abef6f5---64410138048.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a80fd8258---finekezelejubuw.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/8b7f34fb3179c0bff8d68e0d68a98962/sefekalemavadikenigeba.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/dorekoxazitono.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/sudinizolipabepuko.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/66733179859.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/zatoluxedenumetifojabowaf.pdfIn PDF document text
    • http://elm3rad.com/file/97219447687.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/rqn4iu6bptnra9u8dfgl9l72sa/61111885262.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/5707499272f96702ef15383614e3a314/midenu.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/52794665498.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/gogoketusaxutoreg.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/4e6c67837cb1938a221b49eb43d2e22e/zirir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=new+series+successionPDF 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_off00010d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D53 10080 bytes
SHA-256: 9a06e36510ab9a8e7573c4132cfb8e891abc94ab4ba640b912b9ee9232dfae50
font_01_sfnt_off000123f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F8 17856 bytes
SHA-256: 1995dfdf0c649a73dfd356534e3a279127f7f7255ad028e024565234a8f0c125
font_02_sfnt_off0001530e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1530E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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