Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c5735f7fdc5b340…

MALICIOUS

PDF

87.9 KB Created: 2021-07-07 13:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 6a4e328fdcc0f6ad128127305b0fd088 SHA-1: 7cdffa84bb28ec7d41d293f9b6b81880a64d3aef SHA-256: 1c5735f7fdc5b3402e53a7fcb50931971f8f41c6bbffbf9b930a7f62f7c59fa5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites, suggesting it's part of a phishing or malware distribution campaign. The presence of link farms on disposable hosting and compromised CMS uploads further supports this. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://cructi.ru/uplcv?utm_term=alachua+county+jail+search PDF link annotation
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ceef1653822---ruxixu.pdfIn PDF document text
    • http://adveotec.com/img/file/fokevurejulikutoz.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/76616586845.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160874bd9bbf86---nejovegipezobogizazomev.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/d4d57d9a9344b703a82d7d89ee8481d3/zijesorebedafuxi.pdfIn PDF document text
    • https://sca-kc.com/scauserfiles/files/64712572837.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/tujefesutafelaritinidivi.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/fubodilamijuzi.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/55727385184.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/lakizo.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/b250c81d5534f7f899c58413666e7643/58407919083.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/piwajudat.pdfIn PDF document text
    • https://monyetjoget.com/contents//files/93906556080.pdfIn PDF document text
    • http://hkacca.com/userfiles/41441798616.pdfIn PDF document text
    • http://slanfusa.org/clients/47225/File/putevagovokuzufakej.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092481c58ef2---rodapijasofeviminegedat.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/lagenunud.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/520353ea1eed4e9d7fc16ce13c3bdfff/93184005612.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160856b28e6caf---7844941947.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/26c51595f8d604003c849fbe330cdfbd/99487965968.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076478719353---68342874452.pdfIn PDF document text
    • https://argumentua.com/i/file/37094422561.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/20983688587.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/16618281524.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/ec92ceac09e4015c1b02663f7b38d23b/31727519566.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/47a00f2b5452a963371950bb681b3010/xixafotewutizezemi.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_off0000f300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF300 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B17 10652 bytes
SHA-256: 922a7ad69b25a35e4aa45332c2dc295d1cc5c28f893e8e17644eb4a15c212517
font_02_sfnt_off00012372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12372 17180 bytes
SHA-256: 9ae68b9227000860ca13040d449e7bf76bea6357d2cd80c8a38dcf5867b4a111

Open this report in the interactive analyzer, or submit your own file for analysis.