Malicious PDF — malware analysis report

Static analysis result for SHA-256 d92d048bbbb446f5…

MALICIOUS

PDF

139.2 KB Created: 2021-06-30 19:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee44d7796b0b1d3228d5c2f87519fd92 SHA-1: a012e256950d20eea8ff3a975835446a61c3403a SHA-256: d92d048bbbb446f550c0bb5d3b813d708f6739814bfa910867d7e2641e64cb1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to compromised WordPress sites, functioning as a link farm. The presence of these links suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://laborke.ru/uplcv?utm_term=great+falls+middle+school
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0f0be301c---rejafanotu.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d31b489212---24978711572.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16094abba6e8a5---badijizataxe.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d78ac95c5---68365349937.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3a4a02adb---73236051202.pdf
    • http://phpirateboosters.com/clients/867602/File/1581491708.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/12cdf37dddc0c0e7fb6087e2d7af8b7a/pefujimonutofipov.pdf
    • http://katyababash.com/images/uploads/file/xibijuzetuganamukuba.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/j09b3sb0rctomlge5bpbg1jce1/34693030684.pdf
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/24142326681.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/4gsj6ljoggdjjjgdl3sc0s90tl/ferojukulude.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080f5d84a478---27940306008.pdf
    • http://sutphinsgermanshepherds.com/clients/21958/File/sunufo.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/dc52ff69069c744695594a779b7c1741/72208763502.pdf
    • http://edgecs.net/documents/26349983642.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/op1oq0jfbhmjkm4aduita1iuva/toxuxabazeponaladitifanav.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/09d9ea96cffc01971a57c9b9e5ce7be5/nufirorig.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0866d8b43---49313070607.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-5-22/20210522023201450930.pdf
    • https://bczenekar.hu/files/file/potovawatumititinow.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/ac7bc90da436965debf2e1c019cc4152/rajegibituzoti.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b79babdf5---tigotasoropuwamoja.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/qllk49igmj6m6crm0506b5au0n/lodixovomapitizaw.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800d8728899---28241840980.pdf
    • https://binarbaidrealestate.com/public_html/userfiles/file/99622464682.pdf
    • 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_off0001bf7f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF7F 16792 bytes
font_01_sfnt_off0001d791.bin
0739bd7c1df4495efb9a049539fa494e758f30b86fbe2563048368872d96f985
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D791 17880 bytes
font_02_sfnt_off0002066f.bin
9d739f4a219b0fc86333bbb4ea2860023dadaaccd3c1ca3e7fd71ff5b89b934a
pdf-font-stream PDF embedded font (sfnt) at offset 0x2066F 10676 bytes