Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb5015e36ef253b5…

MALICIOUS

PDF

85.1 KB Created: 2021-07-16 11:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: adac2f950005635198e220c136969da3 SHA-1: cefc40642bf26be65e06ae384d7040fa8dcb9712 SHA-256: fb5015e36ef253b5bc6b9a120ebe610dc37203af61618124697c3f77d1e771bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirection, hence the inclusion of T1059.007. The primary attack pattern is likely phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • 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.
  • 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://bahsclassof1965.com/clients/1/1d/1db829f64c2e26d3b32b12ccabba4d7c/File/defilukiv.pdf In PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a05880bc115---73514618153.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210527165919.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/tixelesimibade.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/8f5390dc2766d539efcfd8e866be4e8f/lupiwirilomoxixu.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/gadapuwerovoniz.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/ad68bbf79ed0e67694c56b6d35f84c64/pokanuluzudezuf.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/7768319969.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/fexizedoduvizo.pdfIn PDF document text
    • https://biocoils.com/img/file/nagovogelonavir.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/47914aa7a6fa3ac3a36d6a4166b16ae3/desikunuvipalozotuwo.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/duvufoburawasepo.pdfIn PDF document text
    • https://combrooncom.com/contents//files/17740406239.pdfIn PDF document text
    • http://arablift.net/userfiles/file/28776721706.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/p50tpaq0d7h98ah4j9mtb89chf/69389862812.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9749996dc---lemewixulodesasefakoxili.pdfIn PDF document text
    • https://ridersshop.it/file/55966763898.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/susepixutud.pdfIn PDF document text
    • http://grandinspirations.com/clients/75274/File/benawegat.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/pisofonudebufeki.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105130213.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16099f09db58a4---wofozuforomew.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/fixujafaripemumol.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/mabubepigabevi.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a908644b248---mukuz.pdfIn PDF document text
    • https://petala.gr/userfiles/file/mufugapozap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+collect+quantitative+dataPDF 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_off0000ebe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE1 10484 bytes
SHA-256: 402ad792b030d95ef6d8a3156506bef4ef388e0bb67cdca9d84d3996653723eb
font_01_sfnt_off0001039e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB0 16636 bytes
SHA-256: 69b9abd9c8a9e6721e7bbfb1ce03a0b062039acdc77c94422bfacb44fcbb9dc5

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