Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c8d432503045e9…

MALICIOUS

PDF

90.4 KB Created: 2021-08-14 04:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: a9e48d8bb2100b2089e65c6c3bd31d38 SHA-1: 52e07e73d6c8e3f4c23be1969ed10ece1469219c SHA-256: 85c8d432503045e9d3edab0a5578fb7b25e96b990020b8cd105bcd7ec20b0172
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing and potential trojan threat. It contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' lure and a callback phishing pretext further supports the malicious intent, likely to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=laiye+je+yaarian+full+punjabi+movie+download+filmyzilla PDF link annotation
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b21f6df27a3---fudidetoxubajujo.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f5a1b9aa80b---58050124622.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077697a10640---gelegenunavozex.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/ruvalekipulibegufamimitu.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/visaxefilap.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/8d7529f1708183c58cd9e845f267744d/39026479730.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/45364156449.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/nafiw.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/regawavozif.pdfIn PDF document text
    • http://billsky.ee/files/file/pabeb.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210616_204654.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/95565629570.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/33458609762.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/50618245801.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/sidizu.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/beb8e510b6e82edac53ae4e03abc5b1c/59381588143.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/17558881069.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/dfhfcg6f950efk964256gj29u7/kizolis.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/zitasojer.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/79488291892.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/33207936418.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/48b2008253ecd98cf2057a628c44add0/weromexosisubavebofilez.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/pegetelifanaxon.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD35 11044 bytes
SHA-256: 914812f76ee9d1716e03e93db701a1dbcd0edcaf15e8c8d72f55759e85bb7f4c
font_01_sfnt_off000116ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBD 16988 bytes
SHA-256: 63ef0350416151b7b6b7150e14d82c1c355f2dd505fb0821876bc9150c0b857d

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