Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb773015b404d34a…

MALICIOUS

PDF

107.7 KB Created: 2021-07-03 04:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8679035c9964f9323b5bc28909faf99c SHA-1: ebaad9692e3f57ef7a84632437a1d4bfdfec8e3b SHA-256: bb773015b404d34a9db54a49f0d6099d34a946c5ea3e67dd0eb0ef95a7bc17bb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is detected as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites, indicating an attempt to redirect users to malicious content. The presence of embedded JavaScript suggests an effort to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/3df887589c45d5fa75d7aff4f247e19f/bixugugemo.pdf In PDF document text
    • https://villatoscana-pi.it/userfiles/file/pewakizedogajijisurapup.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accec2e70be---xatelifof.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/a486497b9e5936cfe2a00400e6e526ed/66151671747.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/bipunipeniwunab.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/8336d29f29749d402cc548975101d646/zuwonutodozu.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/4317761d65d1cddd7889090b196ecedd/99911717718.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecd38d9b74---82153592426.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/82107356568.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/tofaxazej.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dfa6a78432e---foranomotipemakopos.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/83a413c6b12124657791a5d72bba6d45/71579782380.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/lametije.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/melukemaziwejoba.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b62ec7cc0f---lunakar.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/7s9e06kr2fk1a8iht2e04opje2/mazekiwizokidosibenobo.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/qtu92cs72smkrbjpjf35fieas6/gumavamukogokejitefogom.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160970a928332c---merodadovirutafaxew.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfff611c2fb---30280381269.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/6752121144.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/c53053fa4cca3564fc65c69db6992322/14646217966.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/gilafuvubadatudikop.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/g5utqlq7ffj79vtq1u396u7874/2210155651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=ari+and+dante+dive+into+the+waters+of+the+worldPDF 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_off00013ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EBD 18480 bytes
SHA-256: b9ebaeb0c6af45cfa05d3c2c3d3f497d49025438453e82a09fca29239a2351e8
font_01_sfnt_off00016f1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18735 10584 bytes
SHA-256: d53e24c289ea303d0d5d93c9408c7b1d47c77fc6523b38ae1bbd25ba041674d4