Malicious PDF — malware analysis report

Static analysis result for SHA-256 426f37b75102704a…

MALICIOUS

PDF

88.0 KB Created: 2021-06-26 11:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ce95c298cc372c9d5683d9aa3d8a0471 SHA-1: bd691cf7acc8c50148531309a9022a170c3eaa3f SHA-256: 426f37b75102704a240bd59df55f9a200d3361a4d30e3c2456cf0d67d982672b
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or lead them to malicious content. The document's structure as a link farm suggests it's designed to distribute traffic across multiple potentially compromised or malicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://daydreamspin.com/userfiles/file/mawomizi.pdf In PDF document text
    • http://tscyw.net/userfiles/file/20210619193014_85jl07.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/sosigo.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ca3a35690---wazubijalirilisabebiz.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c118b3c9dc9---73390685657.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088662370ee8---69498928816.pdfIn PDF document text
    • http://phillipsbrothersmill.com/clients/6/65/65192871cce8a6e36080a9ebd2808b02/File/belujudaviwiwigunukefafo.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/4e655786f78c691b11034e357d5ebf47/jusisefavutaxiru.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/66166260724.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210507141446772038414.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/80785496037.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/5boqrh70t7qlt4v13bpipvefqb/38744068716.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/ce42a3d557bbf9d402ab24e0525cec7e/tipelotalobitajuk.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/3222225affa2c45e0a959ca0327717bd/90346219729.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/53237628416.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/45795285360d60754d6e61.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2e2269f54---1690826990.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/94974808591.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/hk2ab8plgnvdtsf7momvvspf30/gorizetevez.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/73477231800.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/bfm2qacsv288r3p6ok7mlj8csh/10940683002.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5f7330120---27431046662.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717567d780d---somefekuvatexodevebewo.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/gelexupagulixexet.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fac9e755be---getimosixuzofopubemopov.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff6ad7472b---bojiwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+use+nth+termPDF 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_off0000f4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D0 17824 bytes
SHA-256: cedd4a28979a07ab8ddd64e191f4ccca064126b22d2faa53c712acb18ea62f6c
font_01_sfnt_off0001237e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B95 10248 bytes
SHA-256: 2d8e97a8171edf523fd18ff8aa4859fe0fc94cea582186d236c596302fa9a24d