Malicious PDF — malware analysis report

Static analysis result for SHA-256 710af1fcb3272f5f…

MALICIOUS

PDF

85.5 KB Created: 2021-06-29 21:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c6352bdf768d4c20e9f897c79b9a735 SHA-1: 216e10a084f0ae3c8b5281453435ba3ddf490f9e SHA-256: 710af1fcb3272f5fa5c56629c406b75eb46f6d0ead10ce850d948122444ffea5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. While no scripts were explicitly extracted, the nature of PDF link farms often involves embedded JavaScript to facilitate redirection, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://tectrongim.com/uploads/files/6083719975.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606f17c921e48---vapawovijabu.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/df38eftvfnqig936aj3brkepnq/vizajukexekitex.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/kimeniwonil.pdf
    • https://livre-art.com/ckfinder/userfiles/files/noramu.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/b48a52f51131ecfb27b10a0c6394215f/77985337373.pdf
    • http://writtenmail.com/upload_images/file/pokuwogatabebaduzesup.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160740075c8cb8---wasifetuzotewexix.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee5e56fc71---44130619684.pdf
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/rekajose.pdf
    • http://copy2d.com/ftp/image/file/84257078008.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/f2648add4a1ae8fca6eedd4e5b57e7ca/36677283217.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/fef2177fdb38514eeaf31e224668eed5/6627141760.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f19f81c746---55095662288.pdf
    • http://dfwsedan.com/nbloom/fckuploads/file/xowuxalujobigivuxupez.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/ftnnbntacsqp19pjfu7bs1em28/soxinum.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/f48c486ebca989284bab0555a4e8f9ce/36094694160.pdf
    • https://argumentua.com/i/file/98056034175.pdf
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/21680523581.pdf
    • https://dock-levellers.com/upload/files/vugumefalapaza.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/hupjj118cq12udaktnt0eikhgg/pifotibugolabenamew.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16092834ca25ed---60643531057.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986c9795ca2---49466500744.pdf
    • http://studiotecnicobergamaschi.it/userfiles/files/35233269438.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/e674b7713ebba0f299b9f41bd55a407f/65433663203.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0fa1a0a09---vefetofovo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=ch2ch2ch3+chemical+name
    • 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_off0000ed01.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED01 16792 bytes
font_01_sfnt_off00010518.bin
6306f781b918c641541553b2cdb5c98826c1445db38673b96a4d3c6c555ce6b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10518 10332 bytes
font_02_sfnt_off00011c2d.bin
17ee27a316a734b6658eeea2068f67b8c7ab9282fff927d3a9c6b285340d5504
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2D 17136 bytes