Malicious PDF — malware analysis report

Static analysis result for SHA-256 b74dbe756c985706…

MALICIOUS

PDF

70.3 KB Created: 2021-09-24 13:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b298d31a2dd08d4d0558bf55316542e2 SHA-1: 2331faf48f28e09ecd9e3373eac5fa44539f2817 SHA-256: b74dbe756c9857060f3afbdb8b3526522a5efbcd3aee403be25e76f668296d5c
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 embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm or redirection mechanism. The primary purpose seems to be directing users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=android+mobile+lost PDF link annotation
    • http://sake-tori.com/images/library/File/jaxenuwusivefujixowazeziv.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/wewipefujigozavu.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/2927536541.pdfIn PDF document text
    • https://edex.co/userfiles/files/45686451244.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/161417103db8e4---lekukazupegusuvi.pdfIn PDF document text
    • http://penzion.sarmo.cz/Images/file/7172172807.pdfIn PDF document text
    • https://maturana.cl/upload/file/42056072015.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/b1ee008319466089c65fdcc5a2508ca0/gutira.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/24797553467.pdfIn PDF document text
    • https://apra.pl/files/file/segezedelawimopunex.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/fesavugatarusaxunoguvo.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/lirufufosoxexeweretov.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/66495764816.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/ragowopumigozojotel.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396cec049fb---zokinawitifonare.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/54033916598.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/xafapupuwufuloburimuv.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/jirekamibogudozi.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/jixigamiribidajadupolepo.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/perawekuvogekeromegevitij.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/jebawiniwe.pdfIn PDF document text
    • http://zxsolar.com/d/files/jituvelipu.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/16387900632.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/nexirow.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141a3e53051e---rurubugewitib.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_off0000b28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB28A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9C 16752 bytes
SHA-256: 7bdfa204683aa08fba1d25e58766937d42cd2ab06b912c20104a56918dc5ac79
font_02_sfnt_off0000f4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BB 10368 bytes
SHA-256: 342d4040d895366a387bb47d3f8a731527e0fcb17db49bdbbf11c5ae7401287d

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