Malicious PDF — malware analysis report

Static analysis result for SHA-256 106dd8369bcf1e58…

MALICIOUS

PDF

84.4 KB Created: 2021-06-28 09:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 5d186f114fb9410b2bab115515c1caf3 SHA-1: 74cba7d4f2c050715266929271fd23fa47a79497 SHA-256: 106dd8369bcf1e58dd118babb897057d5398c07ca4e089608856ff2133dbb008
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://catamma.ru/uplcv?utm_term=gsm+planning+and+optimization+pdf PDF link annotation
    • https://harrisitalia.it/uploads/file/mirofaporilap.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//50020224667.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74d31ecd10---sakagetanowitilotuvokaxe.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160807c0a80bd8---derujokusuzobidoz.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ca0d40b24---29852790753.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6ab7ac61a---monowiwikadikapikomosel.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/e5c53a3d1c6a522376162499bb461037/7708501058.pdfIn PDF document text
    • https://triosms.com/userfiles/file/lepakutipevopalikisameba.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c1302a6eb39---24837412615.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bea3c99515---nokufemokejujejerizal.pdfIn PDF document text
    • http://tipiland.net/upload/file/vukamaverobosadit.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/71b3c9a8034bef794e5d1e1dae3ebf19/97939350140.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/0c44cac506dda56b5a07cf538a70e0d1/40217018629.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/f8acb359fdf432d388d6ce4bb40faeee/38772398779.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b6966da51---41775701209.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/40552295290.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/f652feb0af93ddb54a1e8f8e08199fb0/53732292842.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/wejujapififazusapapil.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607867e851e5c---54433416957.pdfIn PDF document text
    • http://afro-safari.com/upload/files/daritezuk.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/dafcab0d0b15ff604228e7c3c29f53bd/74734244453.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/69469e11e29cb7dce33f46052bceaf5c/6727352659.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_off0000e79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB2 10708 bytes
SHA-256: 4bf45da7896b0c6dacb3a787ba83faf8065e5e1f8ee343e13d017892a9a4e29f
font_02_sfnt_off00011811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11811 17020 bytes
SHA-256: 87c4ee7fa6c7bdda05bde26fdde2aa10b0c1a5e56780f63e01e02c2bab8af832

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