Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff9689dd25e877f…

MALICIOUS

PDF

99.8 KB Created: 2021-06-26 13:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 70f3cac27fd7aca04c397dbc0df5fe68 SHA-1: fa79ccac064a2dd829df57de869f81b1a2d0f870 SHA-256: 4ff9689dd25e877fc91c1fb017e5af71fc913f8bac599452db6607db2bd2bfc0
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress sites, suggesting a phishing or malware distribution lure. The embedded URLs are likely intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606d5254a5baf---86982251883.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/9srlj9gt93h3uji9r0fbc8tosc/papexarazodazetur.pdf
    • http://www.logomarcanet.com/userfiles/file/17485561407.pdf
    • http://brownewingfamily.com/clients/a/a4/a4d7a48ed280e719b438ae57db99af5e/File/19269890668.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf4ed57597---74292372663.pdf
    • http://sgpeo.pl/users//file/51191640988.pdf
    • https://t2sc.me/userfiles/nozarume.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/b1f3b7a034b2dee7abc6af6f4ecc68fb/1744862365.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc62518f992---71987657132.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d188674ba8b---76958014556.pdf
    • http://jyjwqj.com/uploadfile/file///2021060414412823.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1129d7393---47515791368.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb595620f8---titoxujutevijakesam.pdf
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/8988233260.pdf
    • https://filetorme.com/upload/files/38516873411.pdf
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/pevujelibakexepumo.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071e8fa5a845---6123690600.pdf
    • http://radissonhoteltraining.com/userfiles/file/98096929905.pdf
    • http://nhuaduongnhapkhauaz.org/upload/files/siwojilafanemoz.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcf9c5ce7e---kusinofisu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e48e991809---17349359813.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=chapter+9+head+and+neck+anatomy+short+answer+questions
    • 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_off0001222a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1222A 16792 bytes
font_01_sfnt_off00013a3c.bin
1c682ef34ff19a4a7f11140c48fb6a90cb5e63a661ef688aa66f558ef4712d0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3C 17036 bytes
font_02_sfnt_off000166b8.bin
6ffc5260178e4eb3e30dc1f8f3f325c0c69fb00a84a5c0260e6d4953d6e30ffe
pdf-font-stream PDF embedded font (sfnt) at offset 0x166B8 11472 bytes