Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fe7aae612346c2d…

MALICIOUS

PDF

83.5 KB Created: 2021-09-04 11:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad576471158ed42db6a5ac2a62a73a38 SHA-1: 06901485485f2f4c2d42626107ea168b23b03c15 SHA-256: 9fe7aae612346c2de8409ad0780ee8834a80b8e8593e0fd7df59cca25380e7c1
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised CMS uploads, suggesting an attempt to distribute malicious content or engage in SEO abuse. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly indicates a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nandishoverseas.com/UserFiles/File/femepagoke.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/vkj2466aq9tmiv766ht4g699c3/80485776255.pdf
    • http://hutergroup.de/userfiles/file/lapofawulijuga.pdf
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078e6fca05ab---mugipajodonudojegepifon.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/a031a6f4e3389e942782583141f6cced/tebakinil.pdf
    • http://stoewebdesign.no/userfiles/file/mapepafafax.pdf
    • http://merrygoldholidays.com/ckfinder/userfiles/files/fibikafojefowowu.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/a133c0ad169eafaf49abc285c633eef0/gurirew.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0d5565bcd94d42d87f3632cfcda61c27/jolefalutegadumafe.pdf
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/ls6o8cqgm94d6lcihr7gfar2hs/9645285408.pdf
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/69867932242.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607041c52d45a---favamumikegoxidokifo.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732023ea905---zorenezefine.pdf
    • https://alarouba.com/ckfinder/userfiles/files/fapebifomewovuragiduxuner.pdf
    • https://open-call.fr/uploaded/files/sutufogevijufedomexow.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a45eaeedc8d---bosir.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbea710612---53064304269.pdf
    • https://prokoncept.hu/admin/blogfck/image/file/89790179656.pdf
    • http://go-pxl.com/uploads/files/79221269063.pdf
    • http://stalmont.eu/userfiles/file/29957178685.pdf
    • http://tvtamminhphat.com/uploads/userfiles/file/pelularib.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ae115e7fa---koxofagal.pdf
    • http://debandhelder.nl/ckfinder/userfiles/files/luxaxokasubigozataxen.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/dd6f9363c409c05b47567fecfb81fc4b/tolikiwuxanowos.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=hotpoint+clothes+dryer+manual
    • 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_off0000e0ad.bin
0976c1f35cabff7b0cea12197c2a216725e9411eac1dacf70630a8a34afa4a64
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AD 17820 bytes
font_01_sfnt_off00010ecb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECB 16792 bytes
font_02_sfnt_off000126e2.bin
a52899f009a06ca3cd78abe526ddf493eabf3bb8db5a34b915057b7140ead31c
pdf-font-stream PDF embedded font (sfnt) at offset 0x126E2 10984 bytes