Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9e6a91dc65a19f3…

MALICIOUS

PDF

86.4 KB Created: 2021-09-03 18:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6385044bcb5fd4442a8b03055c7ac595 SHA-1: 7c5f5081d088f2d96a54f69b6bb73b47e64f4e39 SHA-256: a9e6a91dc65a19f388a64fea82c5b77d8e3932fcf061f0c5dcadb5ec1fdd7d32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and other disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://cnc-soustruzeni.cz/files/file/vipusuw.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609478f5b1518---92665509855.pdf
    • https://le27.fr/docs/file/mizigole.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3b1835468---67686716756.pdf
    • http://edumedcare.pl/upload/files/2608232968.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca4c3efc83---rodowabogevurixitunel.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5917b9e24d---56931605305.pdf
    • http://brickchamber.com/ckfinder/userfiles/files/rodubagefilizedotap.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804f068ff1a---pimifagof.pdf
    • http://shqinze.net/admin/upimg/file///32000538302.pdf
    • http://cabini.it/userfiles/files/gabowoti.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/338ffe0189383f9f0abb0e7b35e94177/40293773353.pdf
    • http://wumag.pl/userfiles/file/fiwexazevemu.pdf
    • http://abcgsgeds.friendship-match.com/upload/files/vajarobuvuraw.pdf
    • http://munsusa.org/userfiles/file/20210816202210.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073050b5363b---70380914148.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/9b588e8a058b4fcbdc4c357024d60120/26198570012.pdf
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/kakidebesesawibikenoba.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/f209dfbfe05daaffd912b2c47a77888c/sodezekaluragoget.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8546fca801---poweronabovorabene.pdf
    • https://condicionamentofisico.com/arquivos/file/naxegexaxosozetoxabedalo.pdf
    • http://bushurov.ru/images/files/39871696831.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/5ejsulqvvnlkit43cji58jhbh0/57285405290.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=flower+name+list+with+pictures+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaa8.bin
551ad820bdbf987de327a5092b79f0faadfda7ca69ee359243ba0345240ac649
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA8 18564 bytes
font_01_sfnt_off00011a6f.bin
99f0bc8de36d7a38ae37e06cdc2c646aa55a23179d8ee17a03ec58d0ff260825
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6F 11048 bytes
font_02_sfnt_off000133fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x133FC 16792 bytes