Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7166d7accbc4f29…

MALICIOUS

PDF

89.1 KB Created: 2021-07-09 10:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f6216e2cf3db7116beedfaa74762b112 SHA-1: 5628ae864dc862d9fe3cc42d95d6f9527f339cd6 SHA-256: b7166d7accbc4f29dbaaa84295d21b689e2428e9ffbe0af95b45924252d346d8
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are associated with compromised CMS uploads or appear to be disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm on potentially untrustworthy domains supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ecandrychow.pl/Image/files/61188576689.pdf
    • https://ovalpolycoats.com/media/21481455559.pdf
    • http://atomleasing.ru/media/File/kunivetiwiguxarupe.pdf
    • http://prmakeup.com/Image/files/volomarofofew.pdf
    • http://studiotecnicopetrillo.eu/userfiles/files/nejom.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/dac0da294106aa94ce9900a7774f926a/10854400235.pdf
    • http://jkmdc.com/aversystem.com/userfiles/file/vilowarezukatutigi.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4213fc284a---46344109940.pdf
    • http://alliance-ic.ru/uploads/file/pubawusu.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/hh7kope3p9mto40mon4miu79r6/63040065336.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/4ca156c2511c01db7e059e97ca78af52/25171924944.pdf
    • http://hnkingdee.cn/Files/file/202161910652.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/5ab86bf60eee6d6c63ac0531eca0258a/42634400190.pdf
    • https://bselink.com/userfiles/file/2871702087.pdf
    • https://thuaphatlaihoanghuy.com/uploads/files/20015206559.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/1a6bbbaeecaa78f58740571f7e3ffdaa/dobetan.pdf
    • http://cathugo.de/res/wysiwyg/file/81007519999.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/mnrq33ojhhd1dsd5q9k131dd6t/wamotan.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b44f23d2b9b---13124552488.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/fv5j52760rmfqdt2q5u4pomi8h/44749640195.pdf
    • http://cbestdesign.com/ckfinder/images_store/files/96223842819.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/2357a2802278152a7b7f684100fd5b7f/27242837481.pdf
    • http://cdmvt.cz/sites/default/files/62055413547.pdf
    • https://foulardfotografando.it/file/walemesuvavifexolagiwazig.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/ff92d28bc2a7311f064c50439ad1579f/gurexutabip.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+only+kind+of+writing+is+rewriting
    • 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_off0000f9e6.bin
e6b92951a6f470f9d58a5dde10dfc5762131286ac481346c2ba32d2acd972d0f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E6 17108 bytes
font_01_sfnt_off00012689.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12689 16792 bytes
font_02_sfnt_off00013ea0.bin
c8e46f17b46e9e981176bc69fd002d7bdf3cbe9a4bc1132e0a772d511d80996c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA0 10728 bytes