Malicious PDF — malware analysis report

Static analysis result for SHA-256 36c921ac969393d7…

MALICIOUS

PDF

73.6 KB Created: 2021-09-20 15:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b337cf690d3f8425c1eb49701b886831 SHA-1: 4de5f75b4cf8e2e862b02ebb3c09ae4add6ca090 SHA-256: 36c921ac969393d735079319e12032b5cfcad416eb5474f51cb3e77534d9475b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. Several heuristics indicate the PDF is part of a link farm, with many URLs hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/05103a5788f8c5b0a98fd16d3b4d471b/21803747729.pdf
    • https://cncunse.com/d/files/89332284395.pdf
    • http://evaemlak.com/userfiles/file///12787097517.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161325c91034ed---57312766990.pdf
    • http://paramountswimwear.com/userfiles/files/pikeli.pdf
    • http://stellamaris.cz/userfiles/97424679719.pdf
    • https://razredna-nastava.net/files/fosepitovagalis.pdf
    • http://yakutiaprime.ru/SITE/files/editor/file/pufuwapew.pdf
    • http://ultraljud.nu/bild/files/58838445345.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/3f8a9a6c2172f3faa5e3f84a562d5d89/dobinuzaxematise.pdf
    • http://galerie45.com/userfiles/file/64787514733.pdf
    • https://lawweb.info/mycms/admin/userfiles/file/70818723419.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f408bdf5ec---24459062588.pdf
    • https://sklep-pinokio.pl/web/uploads/files/73103312363.pdf
    • http://ibconsulting.it/userfiles/files/refivebifoxotinosaxa.pdf
    • http://chixue.com/uploadfile/file/20210905130242.pdf
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/rubiginan.pdf
    • http://usmleworkout.com/files/file/kazutitebenogur.pdf
    • https://nasikampung.info/contents/files/79937411208.pdf
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/69970481918.pdf
    • http://fishtech.org/uploads/userfiles/file/file/30701480736.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137700c0a3ad---76103111398.pdf
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/tolofovolonevesomuvaferup.pdf
    • http://pescepiana.eu/userfiles/files/fakoluxikedimixabato.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6j0csm8mrvevhh8b464f9n1c55/33848781397.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=cloud+tv+premium+hack
    • 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_off0000ba73.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA73 16792 bytes
font_01_sfnt_off0000d28a.bin
2d59db7081e5d0762b79a7f429130130a9226fe2f5c200b3d94c89cf1fa26552
pdf-font-stream PDF embedded font (sfnt) at offset 0xD28A 10796 bytes
font_02_sfnt_off0000eb75.bin
f209216166b1e4226024f209f08b9b17a0de69b3c3454d8f85100132917530d0
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB75 17648 bytes