Malicious PDF — malware analysis report

Static analysis result for SHA-256 79447365a3e0a04d…

MALICIOUS

PDF

91.5 KB Created: 2021-08-25 16:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6ee4c13e6b10b8da691cd14386f87d84 SHA-1: 1c2e0a1f75eb9382120e8a719ab5218624c2c294 SHA-256: 79447365a3e0a04dccb8250a79425e11066abcec96f9c4c8154b95c526313be9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO poisoning to drive traffic to malicious sites. No scripts were extracted, but the PDF structure itself is used to host and distribute these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9357

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://www.kowel.com/ckfinder/userfiles/files/1626118061.pdf In PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/13215927624.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/ljphnia6rbiuef2m7oqhaqpbtj/41519394829.pdfIn PDF document text
    • https://isosklo.cz/uploads/pazawosudisazevim.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/6720b53c8a4ed033fd71762bab502f56/33888944541.pdfIn PDF document text
    • http://shhs69reunions.com/clients/e/e9/e92da0bc0099326815942f81a5c18dfc/File/92397159935.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/96401380598.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/josuga.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/zisumosejimiveziviwelib.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/427d526cbb6e229b79b17dbe5e5827b0/tavimavozitifadesalofemo.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/4cb7d83e7a442671a0a886d901c2d6f5/16764390170.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/76104662500.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098ad26458c4---sonosufeget.pdfIn PDF document text
    • https://mbbs.hr/files/67048359092.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160822fa691a6f---45954766940.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/9fc8d5221930a2dfa26e05f0fc4d945e/donimiwuxul.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16096134aa39bd---zujem.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/c618fd2fb9170075df1d4b71c5602fc0/2821422507.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/87139180581.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/zepew.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d2d997200---zojumis.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b82f11be1f---gabetuvirogisujasogiviw.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/12124630490.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c19825496---64045431920.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/87048973207.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=physics+class+10+notes+pdf+downloadPDF 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_off00010b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000123aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AA 10992 bytes
SHA-256: 47777331dcca27a8b6bb84529976682fe8c7d76e5ab119daaf3875c3bdcc0f76
font_02_sfnt_off00013d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D3A 16808 bytes
SHA-256: 88e15f347e5ccb895a6119727dc26d03b2da1c7bd6ed066a49bb05723ec5b8cd

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