Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6e97f1222848fc1…

MALICIOUS

PDF

74.0 KB Created: 2021-05-15 19:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d60a3390b40099bf07ded6da7844c73f SHA-1: 7188961d70f4e01ecbff75f091bb4296cacc780f SHA-256: f6e97f1222848fc158f6c2a18964be904fc96720f3dd9560b381f6bfd363fc36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. These links likely serve to redirect users to malicious content or phishing pages, potentially leading to further exploitation or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/geet6p4vkdgf6p58nge82oaeje/tumowovarudabub.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/m1he7eh4u2aac76ol918qn2b12/36242651587.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/1uorocmchk3ed7mb03dul39e62/38023923339.pdf
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/ftq1nqg28fkd1khfhln3pt5neh/61890655052.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797c0bbb928---zoseradanomiwifuxilu.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/e15a448b2cbaea114611f475d4d0f04b/beluvajorezuv.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc8c3a47eb---xikujuboj.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/67bbc99137e6fac47ffcf8883db183a8/xazagoxusuxuxojuvugona.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/7cd850f87befce4eb7322729fce22b1e/30248679270.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074164163f18---nenonubajipab.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5571df58f---25951299213.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084c797bb076---23228648404.pdf
    • https://aawyx.com/sites/default/imageuser/file/69645060736.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16080ca14061f1---winulokuwiwamim.pdf
    • http://vladjurnalist.ru/archive/file/vunoxorokawafasi.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/4f4ffe75220798d7047c45ee1f64eb97/32657707990.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=printable+calligraphy+paper+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8ad.bin
56ae6e8c3ec2235b1a9840f90e3cb1e7aba100f30e9be682e634a1dafae91944		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AD 5480 bytes
font_01_sfnt_off0000fb4c.bin
94d710563d48ede4b0860b10b5eeb11a911cd3d7d094f8ffc77f08f9d43662a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4C 10912 bytes

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