Malicious PDF — malware analysis report

Static analysis result for SHA-256 d26230cc760feccf…

MALICIOUS

PDF

65.1 KB Created: 2021-09-25 10:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6496bc7e062a2a51a0862a49f8c85059 SHA-1: e43efbb7cb8e2ec0692c1d9688a6626d0e07e922 SHA-256: d26230cc760feccf9fd763fffcaf26a3c097678652f98244dc7e524b79f91e30
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of a link farm pointing to multiple distinct hosts, some of which are identified as compromised CMS uploads, further indicates a malicious intent, likely for phishing or malware distribution. ClamAV detection as 'Pdf.Phishing.Trojan' reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5448

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://refakatci.net/userfiles/file/85471802967.pdf In PDF document text
    • http://tantusmarina.com/UserFiles/file/22232266548.pdfIn PDF document text
    • http://adfaveo.com/image/files/20210915_221519.pdfIn PDF document text
    • http://touchpanelpro.com/upload/files/40462282471.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210909014910447.pdfIn PDF document text
    • http://yuli-china.ru/d/files/42868057833.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/demezozijogutudelutotor.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/loferelorepu.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/34425705741.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/91868891356.pdfIn PDF document text
    • http://telecycling.info/files/file/gipukunasatev.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a3d5024a0---fodapufituzoz.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/c38e1237460189ebffbac3ee4adc897c/54175735656.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/zetikakuxona.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/64489222802.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/bugiburu.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/kafipumezunusanikuxoka.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210909114456.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/duluzaselomunasose.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/dotivowixeme.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/52962419831.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/titomidovazagumefiregora.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/wokejirefopixutanomuxe.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413be571812---zewowodufaxozixuri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=pengaturan+gyroscope+pubg+di+androidPDF 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_off0000b356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB356 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6D 11000 bytes
SHA-256: d55d5cdd9694960b74a6ef15e05c9f0dd8461cc9a4b5e4d64f06746df03cf56e

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