Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33dcc3890afd7b2…

MALICIOUS

PDF

83.9 KB Created: 2021-08-21 16:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 80887e1260ee7f27db24cf09b76db050 SHA-1: 36c502942e796cfdb10ffa3fa65401d03098236a SHA-256: e33dcc3890afd7b292cc1efeaaf6bce79ac68fdd0867aa10e70197d02dc9c015
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit vulnerabilities or lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/90defb4c252b27c3479695c46e9edd20/25890116772.pdf In PDF document text
    • http://wajl.net/img/file/202162120196.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/gapulugip.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/foridowage.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/vamedulutowof.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/21840185738.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1626958829.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/vewirogulomobaxuduxatod.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085dbf31e4c7---96789988118.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/5q8u76lkpu3e1kulc7ui8liif5/rumunozemaxiduded.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16090a6eb46c9c---79720651863.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/wefedavafilived.pdfIn PDF document text
    • https://jss-moms.si/upload/File/debarinig.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/natopivovabarakuf.pdfIn PDF document text
    • http://better-pharma.com/images/file/files/64016959734.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a95118d64e0---11207008083.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c942502df0a---gurubuzo.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/14643120096.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/6ugrc2o32g32gu692p6rot2f74/2644521415.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/d30b99db976644c35ef0bd56c55c7319/66270340278.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/gekafidun.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/wijogetuganofarudaxik.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/6de917ecb315897ec76395ed1f6bacee/losadamodetikesokufifalej.pdfIn PDF document text
    • http://skylineidaho69.com/clients/c/c7/c7306e0a9cc1d421caefa9c307ca601f/File/35283139061.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=relacion+interespecifica+depredacion+ejemplosPDF 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_off0000e36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36D 17072 bytes
SHA-256: cd9c39843ec453495280140cba246902ef28625cc4c6d430e56b563bd07116db
font_01_sfnt_off00010e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001268a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268A 10956 bytes
SHA-256: fb25a89d24909297b1c0f15fece8767a35e0eab28e1f89f895315b6483f17e6c