Malicious PDF — malware analysis report

Static analysis result for SHA-256 4efd7980c38aa246…

MALICIOUS

PDF

86.4 KB Created: 2021-06-27 14:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b4a637a21cb3b3dc59ba8f051f8de285 SHA-1: 724e2a48cc38478b738c605d65070084cfa7f054 SHA-256: 4efd7980c38aa246108c5e0aefeee7cffa81f4d6f2ae932a0249e85dba81f354
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to numerous URLs, some hosted on compromised CMS uploads. The document body is unreadable, but the presence of multiple links to potentially malicious or compromised sites suggests an attempt to redirect users to phishing or malware distribution pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://bmw-zona.ru/uploads/file/69780688945.pdf In PDF document text
    • http://bjbtrh.com/files/pic/file/xaxesewobojek.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a2577bd1d5d---novarezetavagelulunemafut.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/67f3hfrolshcat52jkkmgk123a/4868828255.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/9750302304.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/tebud.pdfIn PDF document text
    • http://apcmagon.com/userfiles/lajeravujedofusijezatiwum.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/2fb0273736c76f5563c8545cac2ef597/15724943141.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/15837571236.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160760351cd7dd---30993316865.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/53573599158.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/buvupirud.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6152e7616---71719384454.pdfIn PDF document text
    • https://dprkoreatour.com/uploads/files/jexipufekipivuzazotodo.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/zedawinikupaxoganisu.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/pebinuwutibozavitonokosuk.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a809e05ec3d---53105644547.pdfIn PDF document text
    • http://learningkey.org/userfiles/68422815616.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/ll1o9o635uovj2k855i64b1s36/tiguvolarumidubosefefudu.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/lt5rsllil7fh7fd63cshctmn4a/49158235825.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a786e7344d---suviki.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/9214b1a04ac5dddb43f8b03d2f4916cd/tatijimarotopujewupinonor.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/62626775428.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a300f809f1a---jetawedilexapigivakozale.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=cider+house+rules+theme+songPDF link annotation
    • 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_off0000ef36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF36 10664 bytes
SHA-256: 3720246fca396f2909cf22a1f2c2fbd88887ebef9019000eac3bac2ea20e5ff2
font_01_sfnt_off00010739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10739 17236 bytes
SHA-256: 586b3f012921a7cd59a0e0a0a78d1d29071f0712ec9aedf6dd77ea9aab9b20a8
font_02_sfnt_off00013432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13432 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1