Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2504a6ab4903c3b…

MALICIOUS

PDF

69.4 KB Created: 2021-09-01 19:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 573c403ef5acb801b8dad4077be0511b SHA-1: 8a9a2c28bfcdfe206cebe1d9151e6e1b51f32395 SHA-256: d2504a6ab4903c3b968fc2e1d9da847715f05ae43ff0f96d967417f6c289eac8
156 Risk Score

Malware Insights

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

The PDF document was identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload directories, suggesting it is used to host or distribute malicious content. The presence of multiple links to such compromised sites indicates a pattern of using these locations for potentially harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d94e281f60---28182558842.pdf In PDF document text
    • http://metalzilembo.it/userfiles/files/2600982251.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/345dab9f478e872dcc34aed72ede59b3/rirokobabumerek.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16074a35b79960---figoti.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/isacmtggr962r7umi0am96ssl1/tafuvosekadax.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/70334221053.pdfIn PDF document text
    • https://drsaman.com/files/39471200673.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607773565e880---30903524568.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/fakagozetu.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/rosasuxuwasozidimivi.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e79f254db---suvibodapuxizozipokaniko.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/70296080283.pdfIn PDF document text
    • http://newo.ru/files/files/21939225079.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d83a1b7f7e---77157917847.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/debisefosubagasaretato.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45224414309.pdfIn PDF document text
    • http://nmglyxx.com/userfiles/file/zejuwobopugozeburokiz.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160893ea4dfbe0---ninabimapojododenede.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/gulojubekuvi.pdfIn PDF document text
    • http://abc-tel.ru/data/File/54027533676.pdfIn PDF document text
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/30306722708.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5d516ba07---bobewumomuligitena.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/pisaribitopojutawub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=coenzyme+a+biosynthesisPDF 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_off0000b0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CF 15552 bytes
SHA-256: 7c6089ad70054294ff697d1d78ab7957c437c8d3ba5adb7081ae708be0a11518
font_01_sfnt_off0000d89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B6 10572 bytes
SHA-256: 8b8cd4488f5b4de536e0c25ab68121a4ade840326e54e09df9378df0beecacef

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