Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd13e5304940a470…

MALICIOUS

PDF

67.0 KB Created: 2021-09-29 12:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 08238bef75ab87330b52b379d4303f8c SHA-1: f9cd607db05dc8e0265a3605f6af97a6188c755d SHA-256: fd13e5304940a470a9a92719cdae1e311982cad722a70fc0f8c8d5632deb95dc
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6374

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
  • 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://needletherapy.eu/upload/file/55251876558.pdf In PDF document text
    • http://amandamaitland.com/images/file/rikafapemaxirutodagegero.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/xibenipumizunemegamiz.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/65889597326.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/67532147846.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161395f46cf5e3---kumiro.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/62873143959.pdfIn PDF document text
    • http://immopolignano.lu/images/32893881025.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/eeulftpt3r9dqfqubmsftedga3/raboziwipulo.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/53477004697.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c0d5d6f32c---jisomatavibekeke.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/vulov.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fc09b7906d---58688060346.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/51803950018.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1b5be48a1---jezekigubetetivasijedu.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/52209611454.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613424fd46845---lexazamug.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/momumimalipudegifos.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/fepam.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/24627795002.pdfIn PDF document text
    • https://0900107678.com/upload/file/sitifonebokunapavoruruma.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/megawetalugamufepi.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/14978239811.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/29183960185.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=naruto+storm+4+by+sansan+arPDF 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_off0000b40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB40A 10408 bytes
SHA-256: 10a6a46864ccfefdbd0ddbe8ba4926d538700ed03396608dde96e6b202a22287
font_01_sfnt_off0000cbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CC 14368 bytes
SHA-256: be9681c875c7c9ac1d9dc00077210f7135919320e8b4b3c337c5083a9669dac4