Malicious PDF — malware analysis report

Static analysis result for SHA-256 f44601b6c2bfef5b…

MALICIOUS

PDF

88.3 KB Created: 2021-08-23 13:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 22649cef6b792a9689bcac23354c25e5 SHA-1: a0afff921520e7fd74194a5076bd7b56c9e80e42 SHA-256: f44601b6c2bfef5b277b2d2137fe13b8d8c392919e6b55ed0e4b4861c67ea44b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a callback phishing lure, instructing the user to call a phone number for issues related to billing or refunds. It also includes numerous links to potentially compromised websites, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://securitydm.rs/slicice/file/jabokodukigiduvasujekiriw.pdf In PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/8006d28d287abb3d72547cc1d359f107/23707573624.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/b0ed72ff9f62b2615db78a970abedb21/pojopesepotutute.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/gawuw.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/41717975823.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160be185b4fea7---52751045789.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/19392743757.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/dciqds18uoe2eklksq33a1c3gs/zinitila.pdfIn PDF document text
    • https://mimpisiluman.com/contents//files/20265893592.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607375c4b39b8---rawotanopolamogile.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/b24d88962aed19ca863c8c4bfff372cf/48865871275.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfaf4637de5---11001190362.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/viwizafapijomazido.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/mivutajifexopokumin.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/tixis.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/92389383538.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/ffc9c1f56765e2d2391aca6b2a8dbee5/21750119529.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/siwuturotojipuwakujinamer.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-6/file/somapununofabulo.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117289a4a758---27685702196.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3775e60c8---vuzovemom.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/93310296086.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f71eba53412---4820561114.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=child+hunger+in+the+worldPDF 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_off0000f5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A1 17464 bytes
SHA-256: 7f2280ad2245b01d387c27a749f368b823771056f913c70bb069a8fd0b3a5349
font_01_sfnt_off00012357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12357 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B6E 10412 bytes
SHA-256: f4c4e0d8ee890fd0b23154a95f845b9fe08cbc1a0ebf1e6c0915b2e3ec794adc

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