Malicious PDF — malware analysis report

Static analysis result for SHA-256 5940882957685fa2…

MALICIOUS

PDF

75.7 KB Created: 2021-09-18 23:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 047ab633e3a0f2d50f73507845562014 SHA-1: 1941b4f368c48a5857440a9f63fa780098cf1553 SHA-256: 5940882957685fa23504c9ac19f2f83db9bdb1f687cb1a887c1267a0d341e1d3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or manipulate search engine results. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://wastran.ru/uplcv?utm_term=mujhse+dosti+karoge+full+movie+download+720p+filmywap PDF link annotation
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/tujumasewogubututixoguro.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/63929739290.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/silurokuxanixemaxeme.pdfIn PDF document text
    • https://matagujrischool.com/admin/imagetemp1/file/44995837901.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/41972895977.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/xideruvizike.pdfIn PDF document text
    • https://servicepapik.ro/files/82323300832.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/50390629764.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/lekij.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/49022871390.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/40625948715.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/ab8a9c8320dcb0b70488ceeaa61cbb4f/jogezo.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/ac269da7f4f96df44abdfa4ec7b857c6/luwenejisatadufizumopi.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/64080963099.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1613da533ba6f2---dulidawavosez.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/ruxabadeludifepobor.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/wifejowidanirobepel.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/34636264642.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/65324990518.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf23c5a600---47890464301.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/94452772774.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/78534263234.pdfIn PDF document text
    • http://minerva-collection.net/files/files/63969084336.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_off0000b920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB920 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD137 11816 bytes
SHA-256: a39def9c9255e0ad92c984b84a10e2867cd8306cca7ee912aaef190bcab86513
font_02_sfnt_off0000ed3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3D 19620 bytes
SHA-256: 1cbdb5da3937ff9d51c86ca0612d8fd93821411ed66e42d6a8911bcb0219956e