Malicious PDF — malware analysis report

Static analysis result for SHA-256 b79d4a893365f4d2…

MALICIOUS

PDF

88.3 KB Created: 2021-09-01 06:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1089875d1837ebe945ff2ac13cafbd19 SHA-1: 75e3f17c39feac7e8760660a28840f8b8c6e5319 SHA-256: b79d4a893365f4d2af5ea39f5e0978415fa6e94191c2b13488b99da1ed87e00b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The primary attack pattern involves luring users to these external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://infrive.ru/uplcv?utm_term=enriched+meaning+in+telugu PDF link annotation
    • https://jackyrouxmethode.com/userfiles/file/tajubisoxunubezikojab.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/38952281512.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba4665f3c9---rotukenenekawixekujaz.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/93856574439.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0b8440402---bifimapa.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/27799806275.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/7fbc6662e827298033cef55511ce1696/fipimibutosalolulojudi.pdfIn PDF document text
    • http://miele-service-center.ru/uploads/files/rubewanudaluxan.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/qq6o1me7tu2g63ccrsemf69esv/70338551602.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/25441651267.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/10358936129.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7056c6ef5e---42863177401.pdfIn PDF document text
    • http://yilip.net/userData/board/file/18698964102.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210525041840_688483782.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8fdd649fe6bce4623c3128b059c27fc1/tugiwapejujopilesobugexo.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160861febb470e---luvagikubibo.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/gopixevozipinejosuv.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/59f485017e218dc4a4c899303378fdb3/zukex.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/9b36d274d98aa4c8255c08e68c5dc492/9658181277.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/b20df638d117e60f3eae3b80e24ec686/nezogakunebure.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/vonila.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/xufenugu.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/28583746510.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ccdedfc4071---62318824437.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_off0000e8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DB 21808 bytes
SHA-256: 29fa13a10f584d823f42230a394c8d6ab4c3f93237d0257b20c1c9f5638c0c21
font_01_sfnt_off00012256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12256 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A6D 10612 bytes
SHA-256: 336799f24f0cde8182f9dc71d08e64fa7749f44f29d9634b85bc12903fe1d4fa

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