Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0728ef9b39fa9a9…

MALICIOUS

PDF

64.0 KB Created: 2021-09-29 07:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5ab1e1514d2a5542c14dc715bb0e5e6d SHA-1: 859bd00525156824a57ff0a0c7186119b70a987b SHA-256: d0728ef9b39fa9a9434196da77947751c1c71111759b2be85c83f39e6f239593
154 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of these compromised upload links indicates a potential distribution point for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6279

Heuristics 5

  • 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
  • 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://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2ca555d0f---wipemudidorezobek.pdf In PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/fc25fe3ee5909a4e13cfbda034433d58/74983474208.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/70840199881.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/xarezogunemitukoj.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/61388890682.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/25640349520.pdfIn PDF document text
    • https://msiutilities.net/documents/detigosenirilegafozo.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/75460477170.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161483ec2a3fec---84533205170.pdfIn PDF document text
    • http://unsersohn.ch/images/file/mofumamigizovanezeziluwu.pdfIn PDF document text
    • https://shinaltd.ru/images/file/64180631703.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/22588015944.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/30405079720.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/lenugojolowulewegun.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/varakageba.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/40900407852.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/68999093442.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/lujogaw.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/72363877161.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/98658032354.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/53455951783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=google+play+store+free+download+for+pc+windows+7+ultimatePDF link annotation
    • 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_off0000afc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC8 17124 bytes
SHA-256: faaedd0a1b6904e262ef0ea26347b6630a1177b545025e92387307276519d78d
font_01_sfnt_off0000db6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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