Malicious PDF — malware analysis report

Static analysis result for SHA-256 df50f5dfa8376534…

MALICIOUS

PDF

71.7 KB Created: 2021-09-04 11:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 50cf6a1a8f09ca652948ae9cbc42ffa2 SHA-1: f0bde94a124d06d903309194137b8dd6372c44b7 SHA-256: df50f5dfa83765348f45b74afff30606b6a8fc50c9f5fd9a54baf7f3b8527c7f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The heuristic 'SE_CALLBACK_LURE' indicates the document may be designed to trick users into calling a fraudulent support number. While no scripts were explicitly extracted, the presence of external links and the ML classification strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://inwebjor.ru/uplcv?utm_term=dometic+3+way+fridge+user+manual PDF link annotation
    • https://ludifrance.fr/userfiles/file/51082906450.pdfIn PDF document text
    • https://eurotig.ro/file/79341409938.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaf8aed1cd---89676393112.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/c3e7b5033ff8bcdc4a47aa2d0f6e70e8/seretipelorinemigakaje.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f26244b74b9---tobajesekilitet.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/bipotitilijidizabezek.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1ea6e4e7c---wosapifufizalofenapelad.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/befexizasusikadojitofe.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/368aa2f30832ab4b7df1f0eec7924bf3/70520085088.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/47095842070.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/orph634lcc55cibspv97okhqlv/kuzuvolatipemoronit.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/zudalebanonido.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/nujofepoto.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/bebabajevokufipiru.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612034652fe3a---najuro.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/77305933934.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/pedori.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/jewiv.pdfIn PDF document text
    • http://lg-palette.com/upload/files/66163723440.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/18294287103.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/36815653869.pdfIn PDF document text
    • http://bociany.sk/media/file/xofimorikeregiz.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608414c17af24---dumuwusoxivufafisub.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cc7f555a8---22044528652.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_off0000b72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB72A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF41 11292 bytes
SHA-256: 283faeb28e4a5631583f98f0fadfe19581c089f13d1a9b1be310a8d681dab0a2
font_02_sfnt_off0000e9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A9 15440 bytes
SHA-256: e38eacb9043e08f9a07dd4967d7c1014634e9b2f3a0a375ab40f77e89358e76a

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