Malicious PDF — malware analysis report

Static analysis result for SHA-256 29a9b5eb30e7bb01…

MALICIOUS

PDF

84.4 KB Created: 2021-09-13 08:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1d50f21482a93d91ad61e15428de4271 SHA-1: c9fefab21fc7555d7b610d619d6554f4ed9d0969 SHA-256: 29a9b5eb30e7bb01aa3b95567dc424798d7f2feb320525b28980756d5916f506
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to potentially compromised websites, indicating an attempt to host malicious content or redirect users. The heuristic firings suggest a link farm and a callback phishing lure, where the document likely prompts the user to call a number for a fraudulent reason. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://forti.in/userfiles/file/67347864419.pdf In PDF document text
    • http://mobilahomedesign.com/userfiles/files/12549160340.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/vonidolewusosagelu.pdfIn PDF document text
    • http://master-vin.ru/files/file/miluruse.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/juwej.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/46986793610.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/f8162fcd42b2493f8faa42f043b71c1d/83243676577.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/99510949022.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329dd82be76---ditujazop.pdfIn PDF document text
    • https://jotelek.hu/files/file/23514793078.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/79114144186.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/virakexukovim.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/dilazesamemilifaxeliped.pdfIn PDF document text
    • http://scsychem.com/upload/files/40568069854.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/57061412042.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/65876676430.pdfIn PDF document text
    • http://ciskmv.com/css/file/45411219267.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/74783c24ce45f2cd6ecba75759234202/febidadotuvoj.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/tepufumopozevufib.pdfIn PDF document text
    • https://bliznacite.com/files/23390047838.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/bobix.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/sk6sktnbln18m5snrqj94vqlq4/68238363517.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=task+reminder+app+for+androidPDF 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_off0000e597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE597 10568 bytes
SHA-256: ba4bc0e68d85aff6de9d5035832441449e5a279e3770cd660d7f66c521de1100
font_01_sfnt_off0000fda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA9 17800 bytes
SHA-256: 3f1d3fc09f03265596bbd1a052528a6702c43ab73d732ac72bbe034536010cbc
font_02_sfnt_off00012c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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