Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5871ff923d8c764…

MALICIOUS

PDF

75.5 KB Created: 2021-09-04 20:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a322b33acc896c89329eb99c9cc26658 SHA-1: 16ae557026842720fbab8acb54f2e88b8ed3df4d SHA-256: b5871ff923d8c764bd656edb2049a52213f7cbac94c0927488aeaa14531b0af6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised or disposable domains, suggesting a link farm designed to lure users to malicious content. The document body is unreadable, but the heuristics indicate a phishing or malware distribution attempt through external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://garglob.ru/uplcv?utm_term=calculus+with+analytic+geometry+solution+manual PDF link annotation
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/zijakexezegesafivazejesal.pdfIn PDF document text
    • https://xistenze.com/files/files/vijigabezavabofovusatoba.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/53736138606.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/xomovokufarawulo.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/wexuzimijolazesufabu.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080a4e6ecea5---niresuzu.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/nepafabosoxedemajafavezal.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/b09dvfj2ublp06fhcvp6t1v3d2/27219057825.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/sedumenuzam.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/37334664199.pdfIn PDF document text
    • https://polytex.de/sites/default/files/zefen.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/d9db2addbdb14ddd5767ca4b7926fa75/metepim.pdfIn PDF document text
    • http://safarang.com/basefile/files/mebar.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/lagovoxafirege.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4cd875522c---14365326545.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/vivol.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/rafipudapawawafezege.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b8018f165---samemosuzokevoxobuwe.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe52147dd1---jolawuda.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/b49984ab9bfc7b833fdec22abbd8d32a/79157709989.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d791827cf5---9240789290.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160df12c92a4f1---58098046597.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_off0000c35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC35B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6D 16692 bytes
SHA-256: 8d91ccd34f76a5ebf5fb067fe3b4fe73fd830422e87ceaf1c94078949ada6f7f
font_02_sfnt_off000106db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DB 11008 bytes
SHA-256: f6e97a6c61104af9f99995a905a2c7b467bf5678c099cbcd0bb193f4b91afdb9

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