Malicious PDF — malware analysis report

Static analysis result for SHA-256 8162d47e8c62464f…

MALICIOUS

PDF

82.8 KB Created: 2021-08-28 11:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bcf630a67a022f2f1fcbe1eb67be5e0b SHA-1: 85816d71173a098ca211f72bfb4d02ae1252062c SHA-256: 8162d47e8c62464fa637c139715218428f96fcdfe07072702a065fbd3c13526b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and numerous external links align with a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://mabifitness.it/userfiles/files/vonamorajoraf.pdf In PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/3aaadbb334b678afb4299fcbc27deeee/noxugafezarajidasafipites.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/eaac17b5de88b296fcc51a18c84eb1ed/99979805692.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160addcd6d1908---57538812436.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/pegefopuja.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/88232881684.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/bogoruvapaxosipori.pdfIn PDF document text
    • http://heritagecarletonplace.com/clients/c/c2/c23aa4fb54f25340752d20cfcff880b2/File/1465389004.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/mevad.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/b9afcbf060d7d44c1b312ac3551cbb61/vedowonubajovow.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/dbd6380776f610e891f55668c2eeabc4/nofadegedusobozubukugiwo.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16074fe1d1695b---fapado.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/bokup.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/lubugopoguwozunajajukuma.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/78352643621.pdfIn PDF document text
    • https://purefeeling8.com/data/file/jibogileta.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/78cad78be23e3369644488a661edcc14/16663436839.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/xejasopevitojidiropo.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210825_3EE756ED5213F2D1.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/waruribigonusexam.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/303304b980cc8e7453eca009c4f470ba/15090316080.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608952d29d9d2---tojowujevaloxupafasujax.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/81394646361.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=things+to+do+near+chirkPDF 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_off0000dd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD42 17948 bytes
SHA-256: 1d2349aebaca46a357e3d286e5990ffdc0427c287672551fe7e3bd2eef577d37
font_01_sfnt_off00010c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C23 10660 bytes
SHA-256: 04942be3a01769682dbfff82e6421eba6161e016dd27ceda61011fb17942c95e
font_02_sfnt_off00012452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12452 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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