Malicious PDF — malware analysis report

Static analysis result for SHA-256 270a8ca4c319e421…

MALICIOUS

PDF

85.9 KB Created: 2021-09-15 22:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1af1d1009f10e341cc1f87bfb3b6c766 SHA-1: a4c88a3b0f124455c78f0c9b204f9ce5262f4760 SHA-256: 270a8ca4c319e421bf6a082d5d11a1ea03d10e300efcd216462a1b7b79bfe80c
132 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. It also contains numerous URLs, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to obscure the final malicious destination. The ClamAV detection further supports its malicious nature, identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier clean score 0.1596

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://inwebjor.ru/uplcv?utm_term=email+attribute+in+html PDF link annotation
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/85940946380.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/xobomekumabi.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/75372529574.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/a28ae8f33ec597f8e72099e90a091292.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/43905177974.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/kemotiwaw.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/75335891282.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b492d872bf---kedomopisu.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/68988088247.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/jelaso.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/fidoze.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161314748f3d5e---98267404312.pdfIn PDF document text
    • http://firegallery.ru/img/upload/nebubibixedarojib.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210912_B2ECF05D41EDF7BE.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/mapivegelati.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/degefax.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/51275844035.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/63245663371.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/50284378646.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/9a5b3963bcf9f9df35c89076f020c84e/48901528901.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/mivuzosogomeniv.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/46746015624.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/vofid.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/japukunobiziw.pdfIn PDF document text
    • http://industrialdevices.in/uploads/72189132375.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/xakuzizaxigewufa.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/41773124014.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/sowawedorotigivoseg.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10410 10308 bytes
SHA-256: 6d58aeefa41eae2dfad973522286cbcacfc78abd16c6e2d60c1e27ba5467b7bb
font_01_sfnt_off00011afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1