Malicious PDF — malware analysis report

Static analysis result for SHA-256 58063cd578b4d91e…

MALICIOUS

PDF

88.0 KB Created: 2021-06-30 07:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 873bc7a5b7431aa9da401bc4e58c0a0f SHA-1: 81094ed79a982773f24729af3b82544c8d7b134a SHA-256: 58063cd578b4d91e475884a7a87caef6f415d5d7c646526fc057dca036b3e554
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://fanaf.comarticle_ressources/file/luwolubosaretasebaj.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7069a8ec3---18507896652.pdf
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/96ef78549c0ad0a3662a8d4d1cebe2a8/28730971941.pdf
    • https://whitesal.com/data/images/file/2575_20210629115021.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16099605baf247---tolagixazaxutafa.pdf
    • http://axwelindia.com/uploads/73528275252.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/fe4b921bdd8daf73bf023d40665d9eeb/xudivopa.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/0652b10d653f4b156c7811a8148176b0/selosebolulomeg.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bf097d8e6---zeliwatij.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cfa6d81dd---14186091488.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/b1cbeab052523022cbc860468079ac4c/91647779005.pdf
    • http://bhs-class1957.com/clients/35434/File/74264584672.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090acf88f495---jozope.pdf
    • http://stinpo.com/ckfinder/userfiles/files/xutepimopudow.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/zovipuwa.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf26642ce2---girawudu.pdf
    • https://bleikss.com/userfiles/file/mobumagu.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/3183nqm7ih4p6ntignnojeemub/wefivujejam.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608831959bced---11685554847.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b75dff3d38---ratufufam.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/nl6hmbmeurkbb1r70punnjqhte/vojowuresilejet.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/a93da59f78eb16369da79e755fbd92be/wurepasepakebel.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c433ac53c55---regosobiwo.pdf
    • https://vannordenvastgoed.nl/userfiles/file/vipani.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=maxi+priest+anything+you+want
    • 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_off0000ed86.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED86 16792 bytes
font_01_sfnt_off00010598.bin
f7aa3a9d9aaba89015b53b47f2067ea09fe29e38864d38fb0719743b7d3a5e56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10598 20088 bytes
font_02_sfnt_off000137cd.bin
b76ba1dcaec50bb304e49e3ac604c9a8b7df2c9d366c51cb26af37feeedcc2a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137CD 10880 bytes

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