Malicious PDF — malware analysis report

Static analysis result for SHA-256 80f1f168c37d5f4b…

MALICIOUS

PDF

72.5 KB Created: 2021-09-21 19:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4c92833741ec428f039e9827c7d1ddd7 SHA-1: ca18bc544e210568dbe810dc431c87c788b57229 SHA-256: 80f1f168c37d5f4b7b9bb908eecfe583bb3f1c3790c024651b5ce1c0c27ac4a8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to phish or distribute malware. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://mskgroup-spb.ru/upload/file/kakijusogevilovumu.pdf In PDF document text
    • http://superfishinglewood.com/uploads/files/fobijiwikonepivol.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/luputupevologumebosomo.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/19182711196.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/161457a5f92bf4---guxokurar.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/86879451403.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/podulinozalunazetakozav.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/zajinorotusuv.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/33443841363.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161368fbbbd7e9---94425662437.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/89835432863.pdfIn PDF document text
    • http://bociany.sk/media/file/92754391295.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/dusufabavagudob.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210901220111712.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/96583162527.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/39338692768.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/93301539458.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/f2e15c2324d9a5413d239ff48c6aacb1/33612942320.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/juzediwofugo.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/63275343837.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/23163465445.pdfIn PDF document text
    • http://reopen911.info/media/file/83257922694.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/mavusewelurukunuvegobe.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/51315597951.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=coran+en+espa%C3%B1ol+pdfPDF 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_off0000b231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB231 10540 bytes
SHA-256: 6b8f6d2c07906a1ac8f2a05a1a504a9bd3d25723bacfef47bbc0f28c113ad087
font_01_sfnt_off0000ca0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21D 19060 bytes
SHA-256: b1aa1a09c02f4857b3dbd9bdbe9d7646a976d43a6e8c1099e6a459fcecded413