Malicious PDF — malware analysis report

Static analysis result for SHA-256 f089a7b4c11a3260…

MALICIOUS

PDF

82.5 KB Created: 2021-09-03 11:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e1ad6d8db3675cb12b3538175d5c694 SHA-1: 80c5671fd168f5434c69d29de10c8af706668a36 SHA-256: f089a7b4c11a3260ac1c8289bbb49080ee05bdcf25280645201ebaf29ea675c2
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies this pattern, suggesting the PDF's primary purpose is to host these deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://allytemp.ru/uplcv?utm_term=critical+theory+today+lois+tyson+pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/cffd13b68204c72b70061aa857f8682b/66850444595.pdf
    • http://montaze.org/democms/userfiles/file/87216388585.pdf
    • http://omonetach.pl/foto/ilustracje/file/duzazes.pdf
    • http://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/vezisezewewafifefu.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611899552b730---7633392660.pdf
    • http://dichvugiayphep.biz/upload/ck/files/75498956681.pdf
    • http://ciccioinpentola.com/userfiles/files/99326983530.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085d114cdb3a---5403752526.pdf
    • http://amandamaitland.com/images/file/tewor.pdf
    • https://mkycc4.com/kycc4.com/userfiles/files/28493377069.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/9b61c770053696a1e9c942ae39e6aa18/74815599283.pdf
    • http://nhs1980alumni.com/clients/878257/File/7547281731.pdf
    • http://chiangmai-esc.net/user_img/files/18189338913.pdf
    • http://htwy.com/upload/file/naxugajafagado.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4c649a7b1---11479242436.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708a2977294---10038070149.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/hu97ibd1sqjmdfej76pghjkc2c/rekipuwapokij.pdf
    • https://aaaxxion.info/images/file/vukotisixusawonevabelope.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a1d9af9b8---pinuped.pdf
    • http://hamyarsanatco.com/ckfinder/userfiles/files/wulobejuviralorabegike.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f48424696c---varudolenibivetatam.pdf
    • https://patoman.ro/ckfinder/userfiles/files/tudelazabe.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098330604610---lazusajumimamevo.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_off0000dd36.bin
36d83bf36765b7ef4acfc047f3dc307c4f115025fa19f373bab3b5fd3c2f3e08
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD36 10864 bytes
font_01_sfnt_off0000f649.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF649 16792 bytes
font_02_sfnt_off00010e5b.bin
35c3f6e77d5f48be2c288c5083f2b235bf773d140622b02111565a9be0b4b638
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5B 17648 bytes