Malicious PDF — malware analysis report

Static analysis result for SHA-256 d44fecb78adc3266…

MALICIOUS

PDF

73.0 KB Created: 2021-09-08 19:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: da5687c6d91a72a923f88149a94df17d SHA-1: 9d8260b4f57e649f12edb83ca1e8228ed170c877 SHA-256: d44fecb78adc3266c815dde7460f32e437f4102e785ccfe73ff18b48f729001a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm, potentially leading to compromised sites or phishing lures. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware delivery. The document body is unreadable, but the presence of multiple external URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic point towards an attack pattern focused on redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • 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://wic-net.com/userfiles/file/42865451799.pdf In PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/73043781728.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/fodepalowudizazitemu.pdfIn PDF document text
    • http://lulanjina.net/upload/files/kiner.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/98938430447.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/rapiterukigogetagof.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/liboluvanopo.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138273a3a944---tukedogikove.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/sejororekuxoka.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/babaxonirimuxedewitome.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/jedazogaxomev.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/jozusarame.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/71490304414.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4c924a60a---lomav.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/joxozozenalavajibubusalo.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/31700108371.pdfIn PDF document text
    • http://renknh.com/ckupload/files/92417062303.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/8935820398.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/94484819847.pdfIn PDF document text
    • http://telecycling.org/files/file/dikukuva.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/ic2g30eu1qjagmvao18s0nk7ep/69411645667.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=urbanization+problem+in+ethiopia+pdfPDF 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_off0000bd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD592 15944 bytes
SHA-256: a76bf7c97679dac3e843bac954baf113d00b84b079254cce618261c5157ec220
font_02_sfnt_off0000fe6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6B 10804 bytes
SHA-256: 35c72f70821e8057905a96e4a4a198b0f468e59fe0080e5df0710e5954f57850