Malicious PDF — malware analysis report

Static analysis result for SHA-256 985e767affe657f9…

MALICIOUS

PDF

89.4 KB Created: 2021-06-29 09:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3316c7ac8cd01b24125fe7d07278259b SHA-1: d5f7f3db49e76eecce617fc6853eaf918397e537 SHA-256: 985e767affe657f98c793a5cf65717ae3fc116136496abc9c50764e48222a6dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristics and URLs confirm a pattern of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/a44444bc76d76529cd83ada4d3e3e47c/vetegejadubu.pdf
    • http://altaprecision.com/userfiles/file/20287728652.pdf
    • http://cuspsurgeons.com/userfiles/file/refogepapibabudojalol.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/52fd8e0e0ecbe3fca4645cfe9b07c2b6/pofasevok.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/55843b21da99532c934193e14beb9671/35616684593.pdf
    • http://www.pattyn360.com/upload/forum/files/73699331077.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/a079f80b3ae5a3e21ade34782f991935/7301420341.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d33bba0ceb3---57303264490.pdf
    • https://clinicscrm.com/img/files/86452939455.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/88e48f6641ec6acd48de2d8805fab4df/74789879583.pdf
    • http://magogaralbamoble.com/galeria/files/noburanumopasapi.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c5adbca1fa4---zujirezepeduvi.pdf
    • http://gramercygrand.ru/files/file/laximidipejezap.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/99944023984.pdf
    • http://uelzecht.lu/userfiles/files/wiwategevugixemabarawiw.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/4db52b618540ba9118f463baf96430c8/89912234233.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/0dae223d54283c8cad29d455bf1496f5/10501446106.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/o74oncgggrgk6e1ubgvf8c98se/biwar.pdf
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/ravenobikumepezisavalelu.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/86d3cd213bcccd26a12bea772d823846/44149426761.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/du9tsh67ktjttc35ok8bhi0ff9/gomavoridukiputevanuwivit.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=electric+contacts+theory+and+application+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_off0000fb97.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB97 16792 bytes
font_01_sfnt_off000113a9.bin
b52f4111d9f9fa62dd4197109ad4c1bfa01507038dae901cef94904a46f0e589
pdf-font-stream PDF embedded font (sfnt) at offset 0x113A9 16916 bytes
font_02_sfnt_off00013f89.bin
d5d7e232eb2b14f35b0bf9d4c860d280cbd084f0624aa3c53e3fcb64321c9066
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F89 10816 bytes