Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3247853b72e4f65…

MALICIOUS

PDF

90.1 KB Created: 2021-09-01 19:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ea098f84fd21ab2b09bf79443b6cbe08 SHA-1: 3cb20b76f30f21c100c01ff0cf440f7a8b54cf7d SHA-256: f3247853b72e4f65fd25b178a94f80032e9c66e09a3e9a14275ffc7218e5b83f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to external resources. Some of these URLs are hosted on compromised CMS upload directories or disposable domains, suggesting an attempt to obscure the true destination or leverage compromised infrastructure. The presence of external URIs and link farm characteristics indicates a likely phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5257

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://rumusjitu.com/contents//files/67133497089.pdf In PDF document text
    • http://botosani.ro/img/uploads/file/55784038954.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607868cbf2ac4---82981704923.pdfIn PDF document text
    • https://xn--faade-mtal-p6a3a.ch/ckfinder/userfiles/files/69196485043.pdfIn PDF document text
    • http://tano-cable.com/d/files/rilizisesiso.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/a6rpsdrjd3q1lnmbe2g1ei09vo/kuzumumidafagipitisota.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fc16d039b---vibisevakoxurig.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bb2b3c6e1---gesativuxusodal.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160acd453b8752---88859828815.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/lupurezodoxorisole.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210704130126.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/5te6ovdc197674sih381rrb3qp/58246127450.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/dakejuja.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210619182203_jw97rp.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/c6om0o2anv2abnldptu65ho08s/jamodaluwovoxarejavufa.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ibekfp7c53q3knhl1ne75elnbc/vapuz.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3a112b853---zuvikiwogapanabi.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/27768a3c059255793852cb65fedb3ee6/57954001075.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/zapanosulo.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/543321de4fdddbec56bbe64b0b022493/45955722144.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/10989463741.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bosesimulebofilegaxovefif.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e822228fa---14269208308.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/poditomekozixev.pdfIn PDF document text
    • http://nature-revive.org/files/file/redozoxixovujafojonal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=theology+of+the+book+of+revelation+pdfPDF 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_off0001026e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026E 18660 bytes
SHA-256: 92650a649b8b2c5deccd02df1bfde82399f2a0c7ed875e330bf8e6f22a48f8d0
font_01_sfnt_off0001332c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1332C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B43 10984 bytes
SHA-256: 5d034488a5dc774be2914345acec19c31b4d091089e00246e8580e0ca467c72b

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