Malicious PDF — malware analysis report

Static analysis result for SHA-256 64c9c8764964e43d…

MALICIOUS

PDF

73.7 KB Created: 2021-10-05 08:34:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d9bb381e8e092ce3d02af7385d4aa6ac SHA-1: 0a9e7306f9cecd82eb692baeee76adb1bd86455b SHA-256: 64c9c8764964e43d313c861788cda8c05604785c68de044777737bc55b039ac9
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and external URIs, including one pointing to a compromised WordPress upload directory. ClamAV detected this as a phishing trojan. The ML classifier also flagged it with high confidence. The embedded JavaScript likely facilitates the exploitation and redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b15aee9a5a---gitasebilunedow.pdf In PDF document text
    • http://happyorderfood.com/uploads/files/fifebefivujise.pdfIn PDF document text
    • http://muzeumkonstancina.pl/attachments/file/wesorixufowusezodadotibo.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/fapefelaka.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/ca68317386b8f27834f4d4e30d336c04/wukawenidudorelenowibube.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/sesukenekavifewefujudekep.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/33110526802.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/dovibinosuji.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/81882522500.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/nujexesisatugir.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/40251706124.pdfIn PDF document text
    • http://lilipoupoli-drama.gr/lilipoupoli/js/ckfinder/userfiles/files/rujeru.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/fugupumaj.pdfIn PDF document text
    • https://onlinendttraining.net/files/68808280925.pdfIn PDF document text
    • http://bonsite.nl/phpcmsys/file/xijunikujuxaligelo.pdfIn PDF document text
    • https://greenways.at/userfiles/file/24382950923.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210914002552.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613460d013fc1---15236065477.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/13197842308.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/d6648d1188450b792d14982385424ff1/xukorumexabazejopapan.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/zilavepilux.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/taviwovepexasova.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/66781987919.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/33965789045.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=intentional+infliction+of+mental+distressPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB872 10588 bytes
SHA-256: 00b20d872569fb9867c7acdfa3c042ed2978eac97f620fa203fd8c8ce4d76933
font_01_sfnt_off0000d090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD090 1860 bytes
SHA-256: 562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560
font_02_sfnt_off0000d946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD946 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0000f158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF158 15572 bytes
SHA-256: 7c4de0fe207d0de508dd2ec8e851daad7fc21043f53953fac4dca2432f8a60f0

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