Malicious PDF — malware analysis report

Static analysis result for SHA-256 441839032e2f28b6…

MALICIOUS

PDF

83.6 KB Created: 2021-09-02 12:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 20bfd5da678453f3f11ad5f6598fccdd SHA-1: 3b293ae4b9cdc97de3f5b98d590d6a428aeb0eb0 SHA-256: 441839032e2f28b63e46e9ade86b462c790bd408f8541bf4da6d9c4f835ac294
156 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on multiple compromised WordPress sites, designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, with the PDF being identified as a phishing trojan. The presence of numerous distinct hosts and links suggests an attempt to distribute malicious content broadly.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7eb8ca460---84583682549.pdf In PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/17316307845.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add60e687ee---waxewobuxulubelepor.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/475a30230d6aa3ad6dbbb6875b7a6cb8/defovi.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/85042097301.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/3f122235533f145d3030d641c9c0b852/tajibexirovuxibamomas.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/419f9710baf1832d049875c9e2b75590/52193119866.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/10ae18c2f3335fef31c83de425352faa/80521152037.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8d41eeabe---tewekexaledam.pdfIn PDF document text
    • http://yejida.com/userfiles/file/xukanexonojifakidemu.pdfIn PDF document text
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/56280209002.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/fugoraduwijerevak.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/87450226954.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751d5468354---xovisizinenukukeropekap.pdfIn PDF document text
    • http://claphamtaxi.com/survey/userfiles/files/99894352038.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/tokiwawaw.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/tusodovibitomekufisar.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/5013233030.pdfIn PDF document text
    • http://hkacca.com/userfiles/kajenak.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a15237c35c6f4b204c87ca1a0993d90b/31032658341.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116069e260a2---rewabonaxut.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/xutefikijupufe.pdfIn PDF document text
    • http://babamoleskine.com/files/file/kozijavipukafopemubiru.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/61022605071.pdfIn PDF document text
    • https://aashianarealty.com/file/vamarugorefojidavadi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=the+gift+of+discernment+of+spirits+pdfPDF 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_off0000e1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D1 17776 bytes
SHA-256: af31ad5a3090d76c3cd6d08a00a72beafcea9e3602555bbdf9540f9113cddf06
font_02_sfnt_off000127b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B7 10820 bytes
SHA-256: 80f0d9c2f5365b46d856c280c22178a5f115726462381811489803427e5e2226