Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ab5603939be5eb9…

MALICIOUS

PDF

72.3 KB Created: 2021-06-27 14:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb00d88ee62ef4f1de827bb78de092eb SHA-1: 4cd5171f4c9c912878acd058957f672240cf9924 SHA-256: 5ab5603939be5eb9a8c7036f8dd33bdd7e22a1c3340c85a7c9d3712c6d27d791
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ac516a2f1---nikona.pdf
    • http://soflocops.net/clients/81266/File/19672621527.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/3faff5d4d16e4635e0d274eae47bdd01/sunezofev.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/b7d60e086af72b8b6c1fa39a8a591adf/zuxeni.pdf
    • https://yingzhaoliuart.com/upload/file/kikobixeturofelupilawiged.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1c4b7b096---71185307532.pdf
    • http://konyaozgunmobilya.com/userfiles/file/xugudiv.pdf
    • http://eko-inwest.eu/upload/file/38211765688.pdf
    • http://rajskiewakacje.pl/userfiles/file/tasiwaromitiregiwiwiso.pdf
    • http://andlupa.com/userfiles/file/muvaniwevamuwazosur.pdf
    • http://myappartement.de/web/editor/files/40787331336.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcedf594cce---tegoxek.pdf
    • http://appletechsolutions.com/userfiles/file/61093092762.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160abeff9d5411---79280020190.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f500f701ff---puwudavigujamuri.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=all+my+life+torrent
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • 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_off0000b9f3.bin
c3fec763fa15002fd286c9078e1fe0ae651f785f4d23cc4693dba24a010fc4d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F3 16924 bytes
font_01_sfnt_off0000e4ae.bin
85f15b52139bf4f837d2261ef1abf651a1684deb8292bbaef80ab3b200b78a07		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AE 10140 bytes
font_02_sfnt_off0000fb4a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4A 16792 bytes

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