Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec929d46fb8bd48b…

MALICIOUS

PDF

81.0 KB Created: 2021-09-12 11:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: efbb027f171abf0b251241781a97c2a4 SHA-1: 86de732d7c9c123fed01672f9fa82aca6274676d SHA-256: ec929d46fb8bd48bafd2296e41bce0e114e2b8cb72543f23c9474abc84309d0c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs and the nature of the heuristics suggest an attempt to trick users into visiting potentially harmful sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://alistairmills.com/ckfinder/userfiles/files/zositudebidizefasenagudo.pdf In PDF document text
    • https://alakharia.com/public_html/userfiles/file/nokaxalaniralelofezapafo.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/pazere.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bed63bdec---98930767438.pdfIn PDF document text
    • https://kopari.hu/files/file/32442269305.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/fuwowuvujebaja.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/wakazorabikagi.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/vedewovibowigakiwonad.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/zenijosezigowitagigi.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/32953451293.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/52473476089.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210911_C48536AF8009D57C.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/4074544485.pdfIn PDF document text
    • http://djapm.com/userfiles/file/87465616821.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/59537963812.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/2d907c917f5647e2e9ef3f395bd2ae13/kijubugifuxatikesuw.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/saxuxafadijoga.pdfIn PDF document text
    • http://telecycling.info/files/file/61321485911.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210907144734685.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/funilidutimesepuwumoloxoj.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/difegenemawilisifoloki.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/8f3ddccf6c64e185a989dbe6737dad70/jarerigizilunegatodomomok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=a+grammar+of+the+english+tonguePDF 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_off0000dad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E2 16428 bytes
SHA-256: b88a86d9af905b249f1c1c01179517fe507a13097e847905143dfd65fd15d4b8
font_02_sfnt_off00011d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9E 10740 bytes
SHA-256: 58c24ddf2fe9d53d90f876e5b4fa02f4bea644bd5b4636047560a92baf8b36e4