Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbd8fbe5f8b692fc…

MALICIOUS

PDF

76.7 KB Created: 2021-09-17 02:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fd6272e61cf8f6a5db3fb661990e9801 SHA-1: ebdbb950eebf626b595d7e87a8dae5d019eb8bff SHA-256: bbd8fbe5f8b692fc73f225d44760bc7fe5a063954c57d45cd476589d312f86ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm or redirection mechanism. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the PDF is used to distribute links to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=pomodoro+widget+android PDF link annotation
    • https://yenicekentkaplicasi.com/userfiles/file/pejebuf.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/valugenadunixexedenogube.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/winaraninatupisubeni.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/17400545280.pdfIn PDF document text
    • http://strandedtattoo.com/file/wawagejud.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/dokesexifijowi.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/lukekadotedowaginola.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/todekuresol.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/vovuvolojajegewi.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16133fa58db29d---29240099689.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/23847381664.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/33403222114.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/duwubikakabogudepo.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/44985974490.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/61093684206.pdfIn PDF document text
    • http://belovosushi.ru/files/xafifozixupukeb.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/86397307355.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/jugogaguzitavare.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/sivuretusuniv.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/tutipojumigujizazuvameb.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408d7a1e718---72772285843.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/malipekoxos.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/kixepuvemizupuzodo.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/aa0da0b4e5cba3e05e26147a9c8eea46/wubuxugimiwagumifoj.pdfIn PDF document text
    • 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_off0000c89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89A 17544 bytes
SHA-256: aa6513f1331a17707e7d42b7006c8db5ff48f66ed2dbe4e765fe36adf35cdad3
font_01_sfnt_off0000f557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF557 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6E 10464 bytes
SHA-256: 7681cd3ed550710b52ff28f2e689e8aca39260c6d5f9394cf4645f4d44d4b655

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