Malicious PDF — malware analysis report

Static analysis result for SHA-256 d29693b21672efdf…

MALICIOUS

PDF

102.3 KB Created: 2021-09-21 04:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1e8a290c5561ce07eb0f3bed286d2569 SHA-1: 8896763168930107fb741f78272640e15a867392 SHA-256: d29693b21672efdfb348f96748d79d9199310652e04d1bcb4937ed4d1824a766
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/161462a48daa0b---rujoginesilaxovetafafiraf.pdf In PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/sopavuka.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/81627196361.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/zabofowu.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/b6c6bc962d5dce16f461d53093fcfb9a/64634167890.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/72897460685.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f88a126df9---wipavozupoke.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0f9ef4166---74103606865.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5b8739924---19992477306.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/77487347372.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/kaviz.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/zesawenekovelilefalus.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/desiliremes.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210907051259.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/uk48oj9o13k6e7mjgagd9dkc2h/84222992253.pdfIn PDF document text
    • http://bifruit.mk/ckfinder/userfiles/files/tuveragabipabunopuzu.pdfIn PDF document text
    • http://vector-food.pl/userfiles/file/74324560910.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/9e47reioc9ilk8evp9k2dirnd1/51526075107.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffb7ba527f---zonowalunop.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/biriwapiwigubonupagux.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/lejakuxe.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/56745191280.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/9eda462d8f98c3c098c4f9920baff4af/pagasemafekuxuvafa.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/vekalebopinalizisatavu.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/fupuxakunag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=idle+police+tycoon+cardsPDF 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_off00012661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12661 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E73 19972 bytes
SHA-256: cac2cd2aad429ecb61b7dcd07b77da7fba532b80e4f427c34a19e0ff629bc34d
font_02_sfnt_off0001732d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1732D 10572 bytes
SHA-256: 212b69208891451ae7eb6f26a3791f99aa0b95b774dc8c823fc72a84908286bf