Malicious PDF — malware analysis report

Static analysis result for SHA-256 e98712fb90a40bc5…

MALICIOUS

PDF

105.1 KB Created: 2021-10-05 07:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d50fbc2cbe56b4dfde8474c605bb7eb1 SHA-1: 3aee98d895f98bddae8e595395a46fe586c82428 SHA-256: e98712fb90a40bc533fcb6461c2ca5fd0f8a5c29be231e0e5b35c227aa6bfd6b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings strongly suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://huntic.ru/uplcv?utm_term=honey+select+unlimited+character+cards PDF link annotation
    • http://daydreamspin.com/userfiles/file/vobar.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/bebekawebulujatisixowi.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/30193492553.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/41101979583.pdfIn PDF document text
    • http://ridendo.cz/files/file/26211239793.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/334ba73f47199544ca4bcdff70363a70/wakibetenaremaben.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/pililazugafi.pdfIn PDF document text
    • http://autokaryszczecin.pl/userfiles/file/78979256639.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021091123131692.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/26756244397.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/punodunip.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210915_144754.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bfddf172a4---71258835952.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/zowiw.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/pifexifuzumi.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16151a072c71df---81670676603.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/vatojafusa.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/68471968241.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/7941106925.pdfIn PDF document text
    • http://midel.me/userfiles/file/85633330165.pdfIn PDF document text
    • http://fnathservices.com/upload/file/wapilurokejitugirumagi.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/texaperisogopaz.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_off000127c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C9 10840 bytes
SHA-256: ca90acc9d118356154b0b499b7f25450d0edef137566fa016df7aa8d0e7a9658
font_01_sfnt_off00014094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14094 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000158a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158A6 23368 bytes
SHA-256: f436369579ed061e3648154566be43bf10c064584a7a255fa1aa760418d90fc6