Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a37a77aaf170d7…

MALICIOUS

PDF

67.9 KB Created: 2021-05-19 06:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01e080d2323a7eff4f2f084175bbcf27 SHA-1: 08765bbd64a3d94086723581f922a63348debbb4 SHA-256: 35a37a77aaf170d7de2bd239d2bb247b7b2e8118eff72dd682fc1870c8cc6431
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to compromised websites, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains keywords related to tax statements, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9852

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 http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/e5fc70d8ca391b270a65f413152fea44/67014705993.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98160e69b---totifeso.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b574f0e13---wigused.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606e46107ebf9---kegitopi.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607523f79c840---59632179592.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/mthit2u032rt5k8qr04kcrrd24/dobibalepususukisuvinuzoz.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/4vh0lma739t7in0c0ghprbtsrj/vodirisidalupurigugaj.pdf
    • https://kisikana.hr/userfiles/file/rezamululodebedopo.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ea77e92a8---fizakexafowilox.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d9754d40a---zibol.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a47411704a5---kepegeromawefidojad.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/bbd65c79eb02e7089f1ea23f9e3efcc2/20737882510.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae9065b32c---rodisekogisuv.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e70e15f71---57635980028.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608571f530bbe---ronujekoxu.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083e1ea66c64---lezifuvaxijisifugifame.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=income+tax+statement+form+2018+19+pdf+kerala+government+employees
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d355.bin
d11e8f16f4126782960608dbf1df6dec586626f37b5cd0bb6aab312cf13757e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD355 6380 bytes
font_01_sfnt_off0000e907.bin
7c806ce811248ba83d8206413f43ff34403e0a1c6693d942ca6d0cd5d18fb3e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE907 10312 bytes

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