Malicious PDF — malware analysis report

Static analysis result for SHA-256 92d7f95ea31c7095…

MALICIOUS

PDF

84.6 KB Created: 2021-08-24 18:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eebd67beef8a16aa728a6827f2ab24d1 SHA-1: 1b4b0e5e22e70e2789470c44d8049b108db138f3 SHA-256: 92d7f95ea31c7095117274894d96f8c84dd3ed07f3a168042e1a6a774005c9bb
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating it's designed as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://www.findvoters.com/userfiles/file/80467237699.pdf In PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc629a03d94---28810010400.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820f779ac36---renunejeferugiginanon.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/piroxo.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089bb17d6ac0---kimanafenululekimip.pdfIn PDF document text
    • http://s-box.biz/upload/datoteke/42911927657.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/ruraverajudemake.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/nuwoxe.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/4lcapugdji8i2f4sgtdmribae1/lesidevuforipogibed.pdfIn PDF document text
    • http://ruihuitax.com/files/file/fapowerizalo.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/zapafaxete.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/bixudarekobofezexeta.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/gotino.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/15a255c283772021a898d813579536b2/42953447262.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/bezojivubimidububeligoga.pdfIn PDF document text
    • http://newmob.it/userfiles/files/88002617401.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202106230635119897.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/82860554610.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a443bc54d8c---tabijemiladelubebawavo.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/12c79408eae06bbc188fbaca57d6d92f/61367388540.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/6529922222.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/77848086804.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/b20efd7cc91de6a8e3052015eb53f6e3/vabodogizabazilo.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc2c218231---funir.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/c20e4d4ccc1de30fc31dd4c62cc75a7f/vigon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=down+by+the+banks+of+the+hanky+panky+song+lyricsPDF 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_off0000e33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33C 11192 bytes
SHA-256: 386349c9510dccf3dbd76b4de6953daa733352e937bb23f62e0dade155c7e82d
font_01_sfnt_off0000fd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD47 17800 bytes
SHA-256: d620c56849cf4f698a5851ee9136155ace735c2524395f7dba177e07be43cd34
font_02_sfnt_off00012b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1