Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa24a5ca3fabc44d…

MALICIOUS

PDF

83.1 KB Created: 2021-08-25 00:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0e5a9a019c9291de9918a001cd94f6bf SHA-1: a08cb9f84f4b5b64f9a1eedd74e5c7578625e5b2 SHA-256: fa24a5ca3fabc44dc53bb637e1c41da006b17e1f009dccaf62b110d177e3ad31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, which are likely used to host or redirect to malicious content. The presence of a link farm and the use of compromised CMS uploads suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://drafthe.ru/uplcv?utm_term=bubble+sort+using+multithreading+in+java PDF link annotation
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/a9ace54f6df35bcf92cb9069c9bebd03/kizaduwiwomiwa.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be27ebdcd41---44909050597.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/85039757887.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/59adc6ff84c20db39a46a9f70028e886/jitekobixukam.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607451b81885c---51244117528.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16098c2629a134---80245507474.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/raxubin.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/883f1b564f82c58ad72dffe67602b449/rozerusibalizovuwug.pdfIn PDF document text
    • https://norservis.info/files/files/49433454827.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/53863365900.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/3ac9086c71381e44b3c337869a04bd37/56948998130.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/30598116953.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/cf70b5308953ec3fcbfd3564d028f9f9/33534668276.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f921581c27---disolutigegugogas.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1875f35987---majaruzaxojetusapijivo.pdfIn PDF document text
    • https://vientangluc.com/upload/files/25041808380.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/29133178358.pdfIn PDF document text
    • http://sjhtractor.com/d/files/kixenaxisolup.pdfIn PDF document text
    • https://chp-travel.ir/data/file/fovesaxawerezofo.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/64341817680.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/tgr9uueqlshp0hc96rkfrau33v/41133989507.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/a958e5638a589ef3404b8bf14ebecd28/barijewowilo.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/58060317633.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_off0000dc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47D 17684 bytes
SHA-256: 989a98bfacfc1456cb0221c18adf777ef0180362392192745e4f52c270588c18
font_02_sfnt_off0001234a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234A 11184 bytes
SHA-256: af166a1d788358fa7408cfb8d34807f4285b86d9f71cc94f0d1e69f080166d22

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