Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c6f474d26f8f86e…

MALICIOUS

PDF

81.8 KB Created: 2021-09-13 01:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e20b87b872df61befb50f0ae324728f SHA-1: 20e2f967d48c5822435f656f559782aee9eb424a SHA-256: 5c6f474d26f8f86e0c18955b0ffdf6f4e01f711e17b3d0cefc416f8062705b50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7642

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.
  • 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://erpsamik.com/ckfinder/userfiles/files/91933321945.pdf
    • https://iword.de/userfiles/file/16703181712.pdf
    • http://kaus21.com/userData/board/file/58064486086.pdf
    • http://pttaccounting.com/userfiles/files/40049990111.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/5c6e469ffbae9e264d76752a3502e186/3536764828.pdf
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/kizegokirixamumatudumutid.pdf
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/todefubomifobavepodefu.pdf
    • https://amoslodge10.org/ckfinder/userfiles/files/palusixejekolago.pdf
    • http://gs-metals.com/filespath/files/20210904145311.pdf
    • https://sofupingame.net/calisma2/files/uploads/xopos.pdf
    • http://sobinco.cz/ckfinder/userfiles/files/23401062201.pdf
    • http://samafb.org/uploadfilefiles/tomekutinusujugasumolox.pdf
    • https://www.igescanada.com/ckfinder/userfiles/files/36126491477.pdf
    • https://cpsguffanti.it/uploads/file/77845946653.pdf
    • http://schubert-hh.de/image/file/75165929693.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/cf6a83f3d4976bedab069f3e51f907ed/pobewurimologiwowot.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/hgnjuu8imisq3d8ul7hlnikhn4/42518400705.pdf
    • http://centralcogtc.com/uploads/file/dikuvepuki.pdf
    • https://movingalpsfoundation.ch/userfiles/file/sumigurivizebataxivofin.pdf
    • http://hwangtosidae.com/userData/ebizro_board/file/93535855024.pdf
    • https://elperrocallejero.info/ckfinder/files/gagazokovazas.pdf
    • http://cherriestattoo.com/ckfinder/userfiles/files/99678933920.pdf
    • https://twinslock.com/ckfinder/userfiles/files/80696476727.pdf
    • https://icrs-as.com/userfiles/file/68154182500.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=720p+movie+download
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EA 16792 bytes
font_01_sfnt_off0000fefc.bin
fa46d3e497e752f297a26bb1e3f7e5170bc06b343272c31c748f429e2e25256f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFC 17256 bytes
font_02_sfnt_off00012bb5.bin
989b0feb5eeef34eb4331d9e4420b16886944cd5e8884ef6d46e0962917982fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB5 10536 bytes

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