Malicious PDF — malware analysis report

Static analysis result for SHA-256 7333b16b91628cb0…

MALICIOUS

PDF

145.1 KB Created: 2021-07-17 09:38:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ff3eca7dc6b5b68783fa7f8a09f05014 SHA-1: d4dff34b50043b01083b68da1a7a248c568670e5 SHA-256: 7333b16b91628cb0273c0830e197e4002fcb2ca02aa2aa0e2f7d63c7b19ff345
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, some of which are associated with compromised CMS uploads. The document body is unreadable, but the presence of numerous URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 https://gs-hemeringen.de/ablage/userfiles/files/sikegu.pdf In PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/33a0d512dd1db28b1418e46938874ffc/60926901411.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/kotat.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/01bc3543ec2492426629ec9ee9f1b3a1/latepaduwodateri.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c41cefb18b1---49385410364.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/19359237530.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/aken0pfrapbj8fi1muperqhq79/xikulevafupuzogukolad.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/13832341154d84ff1b7f1f56ac19b0a7/sufibejuvamojawow.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/83532139701.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/wakufebuwijugenebarorajow.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/90094122261.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860e41d5a22---10521019204.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a22cdea4c34---16803671687.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/9e7f1dff8b9a893ac084530a9217ec0d/vakudif.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af80b195a4---ragowotefabize.pdfIn PDF document text
    • http://land89.com/ckupload/files/24476149931.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080d4e35f913---25046838039.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/od072vhioo1jnkk9pqool0b2bo/7678074058.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608478483eea9---61365086937.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/9c1c63cab7294cbed8740bef8dc12e60/wesukesodakoxe.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/lobujan.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/15791177783.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/paluzumaxakivoxeresabifar.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/4489514c0685acff54040a0a339e6e69/ketosagakomato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=all+creatures+great+and+small+on+demandPDF 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_off0001d93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D93B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001f152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F152 10704 bytes
SHA-256: fabb3cd08c8a06a379613151e6525cfb4c42af744c9e1aa84216b06e10885ec9
font_02_sfnt_off000209b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x209B9 17180 bytes
SHA-256: ec5d518fdb661c6a5f81353e8c13b9527c61bf278aeae4908ad81ce8304ac575

Open this report in the interactive analyzer, or submit your own file for analysis.