Malicious PDF — malware analysis report

Static analysis result for SHA-256 9afe15cde5820f51…

MALICIOUS

PDF

88.2 KB Created: 2021-07-24 01:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c5053e3c8c304517696e79bbce4270d9 SHA-1: 8fba6e7f935b3fbb5622011f6f9fd0a8f683e596 SHA-256: 9afe15cde5820f516f8657bec5a8b9b4aa3f41e21be4442a443a947183d0c9fe
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The document body is unreadable binary data, but the heuristics and URLs suggest the primary goal is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160789aa5de431---40021707908.pdf In PDF document text
    • http://kiavysocina.cz/UserFiles/File/vofagobakokipiboxoliz.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/hgm8qa0r2gchf4i4q3ugl3th4v/89107794431.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec0e7f2576---13749601590.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/23917223885.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073dfaba1bdf---44032363792.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/vimuw.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/616809081.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/56861770001.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/98549737759.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/naxekikebiz.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/puwugiwadik.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/3339268044.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160b6a9dc49a27---31445298465.pdfIn PDF document text
    • http://mlight.cz/archiv/file/karujanuxuzovikikibafix.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/21954712226.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/2ee900c7ecd9a81dc14bdd4dc100efa7/72688902022.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d59c439af1a---bebijijasidavibani.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/69614512057.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/xovires.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160928e1000dc2---55774850190.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/kotuwuwagetaxi.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099bdb43c8ea---voligovujexavanikufopeze.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/ronuruderowazexu.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/d15fc50e337a3e84ca98e107df2c693c/39317160728.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/cbml98purlmcici1kl82nfmjq0/lebopelebe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=libros+de+aritm%C3%A9tica+preuniversitaria+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_off0000efe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F2 18236 bytes
SHA-256: 765cae720629d76d84546f443ceed76ee59d9ddd8ccd368510c3f0ab896e5f6f
font_02_sfnt_off00013634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13634 11152 bytes
SHA-256: 0bddb1184d46fec65d0ef9ecb48db56bebb8995d92b733f098e7ed0346d1ea90