Malicious PDF — malware analysis report

Static analysis result for SHA-256 707593c81488414f…

MALICIOUS

PDF

86.7 KB Created: 2021-07-13 23:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f5b0b28544ebf54b48a9a3d5e5fa4894 SHA-1: 67f209551244bb046bf38d0078ec169d793bfdae SHA-256: 707593c81488414f4cac22f70ee340c35bf41ebdfbb671b5181e922098749e94
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://presstone.hu/userfiles/file/54244648381.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b04bf1f883---wejezejego.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a37257cc90---39475254495.pdf
    • https://2ruoteexpo.it/ckfinder/userfiles/files/99499374535.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160921b6424f02---kukirige.pdf
    • http://ipsgroupjjn.org/userfiles/file/totemul.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/eae9b47fd79f4833f631d4f22f3efcca/dudiz.pdf
    • https://dreamscapes.ca/dream_scapes/userfiles/files/xuluboxixovov.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/4b645cf239f12c4c700359e5c3b1da0d/jalowikeresa.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4d5e89978---9887708825.pdf
    • https://diphong.com/uploads/popovipowovuboza.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa362f87ee2---topuzefomoripo.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072d7b70a179---22623693763.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/7e30c9d0768296ebcba858092291ebfe/36112385558.pdf
    • http://autosoftware.company/autoresponders_images/files/balakafusutuwerup.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160911a03ee594---zutizevunogug.pdf
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210605060542.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbf04ecbe9---996672741.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/dlm98oaee7hdrps5l73gfe01m1/tumibezejesurul.pdf
    • https://allcreaturesinc.com/files/files/vawuturoveputo.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086ce7001940---65084769954.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/9627282c4797eec905a0cf35a00e50c7/mijatonezokutufitisewoje.pdf
    • https://doanhnghiepvietnam.org/img_duhoc/files/54075314061.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=common+multiples+of+12+and+20
    • 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_off0000f1a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A8 16792 bytes
font_01_sfnt_off000109bf.bin
674aa0297854ada50ce350232ad7d2b562c97bfc9d8129b611aebd7dd4fd4a0a
pdf-font-stream PDF embedded font (sfnt) at offset 0x109BF 10984 bytes
font_02_sfnt_off00012350.bin
563be6e2ae76927de259af9e71ad15e1cf70cc5dd6b86e511b9f39201e1570b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12350 16336 bytes