Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b503f217fe6d9ad…

MALICIOUS

PDF

79.4 KB Created: 2021-09-01 19:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 74a77da2b43fb26ab6faac3cfb325d50 SHA-1: a8b8ccced58cc5334ccc462ae7316b9c90bc8d1a SHA-256: 8b503f217fe6d9adfec8e3246183cac732074975b3d00959e8aaa0ea8ade03da
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. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it's designed to lure users to malicious destinations. The embedded URLs and the 'link farm' heuristics indicate a primary function of directing users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://dailygiasi.com/uploads/userfiles/file/40513360087.pdf In PDF document text
    • http://f-okinawa.com/img/tmp/files/barogimo.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd1abd56c7---9262646081.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/33267564718.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a446a6f1716---kilir.pdfIn PDF document text
    • http://darec.sk/files/files/juxurezajiradero.pdfIn PDF document text
    • http://fructusartis.com/i/File/73043495050.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/2vi0ab1iohocn6bnuq5r3ms7gb/749894613.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/1f60c8fa6e62c06327425301aea6f7b3/tajunusasugupupazaluwatu.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/vatekewitis.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210630_91B669363338FCB9.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/30953865555.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/12f27ca951f26a956c4c8c17d94607f8/50975503563.pdfIn PDF document text
    • http://poorclarescork.ie/images/13207631879.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/1pr42e7qe83b79n5l2b014t7jp/digimiman.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/0fev0spqc276k486s1u217lp6q/6528402033.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/butamevofe.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/9f3e34af7ef6336a68056c809b191ed2/kejeruzugebaka.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdd4b55e65---dalokitofaduw.pdfIn PDF document text
    • http://xn--szabowski-tub.pl/userfiles/file/2002309953.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/xojuruzenovuzexowekag.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aefefd1e505---lovabupuzozewonuron.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/litabodisobajar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=functions+of+management+planning+pdfPDF 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_off0000d4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D5 10940 bytes
SHA-256: bd21977e35dd3dcd94e15931398743bcc766738fc913bea5b0b77898f69011b4
font_01_sfnt_off0000edf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF5 16436 bytes
SHA-256: 0b3982502152e4dc45f6b64486c412fb638e8f8a40f6334bdd623b05f2bc4940
font_02_sfnt_off0001185f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1