Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d41cb4af9ab039b…

MALICIOUS

PDF

86.0 KB Created: 2021-09-06 11:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ab830559b6670b9dfd18706121d62557 SHA-1: d9888aea3692fecd63e6d7e74ca4ec61c38649b3 SHA-256: 3d41cb4af9ab039bdcd719f9629f22473cae746c2f3e5538518a82d5e1d169ce
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a phishing or malware distribution campaign. The embedded URLs likely lead to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://queure.ru/uplcv?utm_term=value+proposition+canvas+pdf+download PDF link annotation
    • http://fatfailogistics.com/fckeditor/files/file/dusodikanonewukinil.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d6f617fe3---7924915560.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbfcc4cf70---91070538698.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/pupimi.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c272b16a5f5---19909770098.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/zuzubijipufekilibufixa.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/jetudez.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/fda6a27591edb0020e3d50dac233f6b1/17780640764.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/pafaz.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/14115936722.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890fa312e2a---leturapuguvozamozugugi.pdfIn PDF document text
    • http://snsi.jp/image/news_file/68797657416.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e06f08593bd---70976026669.pdfIn PDF document text
    • http://htwy.com/upload/file/16684686214.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/d57a9715ef3ffdc6de2cc1a152dc1704/fogikubevetabegewibogu.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/lagosi.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/81301649088.pdfIn PDF document text
    • http://builderall.info/userfiles/file/50937708650.pdfIn PDF document text
    • http://timebymtm.com/upload/files/84321940113.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076e541e0ab9---46173999955.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_off0000ea79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA79 10832 bytes
SHA-256: 7a5a7874f6cb36a35db6f8ee9f28ba71ecce975df3c16f65a6701287a86fd7af
font_01_sfnt_off000103a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A9 18448 bytes
SHA-256: 8b5444ec294d21980851d401c6b7ee968c457b2799672face09925f4da3c3328
font_02_sfnt_off000132ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1