Malicious PDF — malware analysis report

Static analysis result for SHA-256 7687feb03a9700a4…

MALICIOUS

PDF

69.3 KB Created: 2021-09-25 10:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b3c9692ed76ba51e176ecfc2477e502b SHA-1: f7d629ec0c36918ba0c316b30d9f16b20d870180 SHA-256: 7687feb03a9700a415f0818c8eb5f45eeef27fca0f56fe0692b7d6f3ac56406f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The presence of a link farm pointing to compromised WordPress uploads and disposable hosting indicates an attempt to obscure the final destination and evade detection. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this file, likely used as a lure in a phishing campaign.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3855

Heuristics 7

  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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 3

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
font_02_sfnt_off0000e4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BF 17832 bytes
SHA-256: 91012ab3426cf41ac79adfb70cdb65eb8834412b809a99e7cc56c9fea385d3a2