Malicious PDF — malware analysis report

Static analysis result for SHA-256 79388e7af3df33fe…

MALICIOUS

PDF

74.6 KB Created: 2021-09-06 02:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a302ec0c5bd54885eeefe7d08e9dc340 SHA-1: 7807a85c21f870ddcd02b94b2eb39d499d5f47da SHA-256: 79388e7af3df33fee2892526bcb8087ceac55e3b142e7dc1b5cad744c4c3010c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised or disposable hosting, indicative of a link farm designed to lead users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://corpusbg.com/files/fck/file/35035250134.pdf In PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/pimafefatudokutak.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/80011355971.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c78a76adc61---47770455282.pdfIn PDF document text
    • https://curryleafharleysvillepa.com/hang/userfiles/files/nazufadotoziv.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/83406953890.pdfIn PDF document text
    • https://wittnebel.dk/file/87100088219.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/tekusivokusotabule.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/4c07a0cef481e660307dfa20d5214378/wotosanero.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/kexigop.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/wesujasanete.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210830101726.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/75359450805.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/2190149270.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/zagovike.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/nigimipegigajajolo.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/17345252257.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccea4b38ba---wosijirefoniwirosi.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e8777cb24---64048295586.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/4340201390.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/54492481886.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a69502b182f---86843206977.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/pugexolimulibuwu.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/poxagobokebuxevemozuzu.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/26839056646.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=pune+ring+road+map+pdf+2017PDF 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_off0000c038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC038 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84F 10972 bytes
SHA-256: 86b0c0cc5a6998391c1e667db2dab90611b15d02e73b61792401bc245f7438b0
font_02_sfnt_off0000f1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A1 16888 bytes
SHA-256: 1c60ccf9d040161728e08f9c88cb857ceb413bda334efc266bdbad0f1f015ea3

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