Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b416188d76c2be…

MALICIOUS

PDF

71.8 KB Created: 2021-09-02 02:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 671a26f9bf27d1186f4002d935b68f95 SHA-1: 5d9c4280146077aa55a5f00d71786765a8756642 SHA-256: c9b416188d76c2bec75f1fa2cec65a84b7bd94df95170de892ad3d043849061d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress installations and other disposable hosting, acting as a link farm. This suggests a phishing or malware distribution campaign, likely initiated via spearphishing attachment. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://aldea.work/wp-content/plugins/super-forms/uploads/php/files/6cafdcfd414c73224b573cb19667f6b9/30942142928.pdf In PDF document text
    • http://ahcxdq.com/uploads/file/280015267114.pdfIn PDF document text
    • http://senn1962reunion.com/clients/2/2f/2fc2c703930c5c120d54ce0350dd22c7/File/41169886508.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/93708834674.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5828195680---34738969787.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160e3b89c1a83d---9794642673.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/tabagotofup.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/97554144477.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc5fc69e6e---kezaxerojov.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/29643779932.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/gekolaludegupewin.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/ferilokixigobosujab.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/65286774736.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/0b46f5b4380da145d3d4af2fed79377d/detepaluzokim.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/xasapu.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16084d453f396f---vafuzonasu.pdfIn PDF document text
    • http://chinalabware.ru/d/files/93170597964.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/45843005183.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/8e9827761c040ba98f0140949079c0d3/54513420548.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab475e1747---xorifuxim.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/1903215850.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/tadopezovejir.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/23307275191.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/6805904896.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/juberesojapalepedod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=scout+quotes+with+page+numbersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000bb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB08 11324 bytes
SHA-256: 3980cf650161f88a60099397fd08f1c9c24de84c456280ffc9a2406d2bea9c04
font_01_sfnt_off0000d507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD507 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED19 14268 bytes
SHA-256: 8361b0a49e6a2c199a3b7823bd23af841357672cac9b88fdf4136eb594f7a56e