Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bcf30a56963436a…

MALICIOUS

PDF

88.8 KB Created: 2021-07-25 15:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 5c7e17f3a381973384c5e4caddbcdf94 SHA-1: 20f45dcec6feced788476436d988150ac2c0e26c SHA-256: 8bcf30a56963436abda2efa39dd989afd7ca463e14ed4deacff452ea01884b4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised WordPress sites and other PDF files, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://marblo.ph/app/webroot/img/files/kelademizutusajozegeler.pdf In PDF document text
    • http://humanitool.ru/userfiles/file/26023020933.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/1fc37b6c7e8611647a3fdd4af80d6cd9/fulujigelafasowanewezi.pdfIn PDF document text
    • https://go2germany.ru/files/file/nuxefuduzej.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/c4e3426e607fd9a631d78173c65e8f0b/96649228215.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/25146820223.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/86b9cace06fe9a31a34aea3b18333309/janekatexuputoz.pdfIn PDF document text
    • http://deauville.ru/files/file/joxopotirubulosejoradebax.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c22f73536a4---nojaripidivobibavu.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160780bc85d607---topode.pdfIn PDF document text
    • http://hchs1972.com/clients/2/2c/2cb73362227bcfbd3ed6ae01b5b3dc46/File/21061704381.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c531a112478---2900335288.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/lufofapubirozaxiripito.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/nejue78ke8fslsmqso0elmlbrv/74935352029.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/zamofewurixifuxakimuw.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844c30f24e6---dimozi.pdfIn PDF document text
    • http://one9five.com/userfiles/files/nogaxipamufejofel.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160964cc1eea3b---71417172909.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/fematu.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/sogenenavil.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b8986b3c944---78721723818.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/23644192176.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609879dc490e0---92484618611.pdfIn PDF document text
    • https://cubic.is/userfiles/file/53622674247.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/kiladunademofo.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/33ed6a121fa19fca977f38de08b1b758/gevivap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=math+investigations+kindergarten+unit+plans+for+pre-kindergartenPDF 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_off0000f57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57D 16984 bytes
SHA-256: 57524a2f6facae67417d0178686acbb8c3c456f8ddd321894c6615c4010af284
font_01_sfnt_off000121b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139CA 11060 bytes
SHA-256: 47533183d20cfcc6e7150141197492574faa2b59e3d3469880d6613bfda0fd9c

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