Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e34760451dc717e…

MALICIOUS

PDF

80.7 KB Created: 2021-09-07 19:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 85ffbcb06eb0a46e76e01ddc3e14a5a8 SHA-1: 3c241e278a3874bdf8246de1a9404e87d5517ef5 SHA-256: 8e34760451dc717e84074ba4566d5d3e97279145cc4b7620085f34e583603b51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicative of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the link farm and the PDF's structure suggest it is intended to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://dpt-mh.com/uploads/news/files/73945984902.pdf In PDF document text
    • https://tlproduct.com/userfiles/file/debopogikadatukuwalaler.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/161131de2eb5c5---59666731371.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/xelepupomoguviwi.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/64291512212.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/4f05175e31cc41052d387f4d09c2c17d/93404471592.pdfIn PDF document text
    • https://qualitymattressfactory.com/admin/userfiles/file/90167548941.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/suvidekotosi.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607d1415e12cc---69825259808.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/75546445614.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ec5bfe4ebd9b886b3acddace64199c75/7604768422.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/e1c8e0f16a08ef428fbd02a6fe166548/66361587591.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/kudesewanesivav.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/9da23d2942d509044873ebaf4d707961/bajijefam.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/wavufugalupoxope.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/sijapo.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fb6416968---11924351907.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/savufofokox.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/mi3su96soe0bvsna4657jcgnp4/10681924200.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/8db81dc894c71ebd4f9b8bf04927fc52/24965437040.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/sufijexakubogafimanugavi.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/rarob.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c327a01be---59646098806.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/57239535680.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160c008a6c14d9---pigamirexaxutato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=infiniti+i30+1998+manualPDF 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_off0000d55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55D 10628 bytes
SHA-256: 044ca3e769edc701259d0cb3c27504d13963edbe1917dc939bbe15ad873a30bb
font_01_sfnt_off0000edab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAB 17960 bytes
SHA-256: c088961c7a9241f3d790033392d4d688f4faa18a41c24784c0658fd10e04d8c1
font_02_sfnt_off00011cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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