Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6bcc76dd2ab5d8d…

MALICIOUS

PDF

68.9 KB Created: 2021-09-13 22:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b22c60089f55911598d87cb54904d76e SHA-1: f7a5a4b1c02b2016895da432315f0f782b3c0f36 SHA-256: d6bcc76dd2ab5d8da9b66befa998fb10fd48f3bd6b4cc2722b02d5c1e376df4b
176 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable domains. These links likely serve as lures for phishing attacks or to distribute further malware. No scripts were extracted, but the structure and URL distribution strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://murielbellhomes.com/userfiles/files/kukowalafadazakiwolo.pdf In PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/70cfc722cbc6226423527c4a90c96bb8/jeravinewatefozo.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/26000602181.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/99a3ec50c0319115096d8da709de69c4/40816269291.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/vefesuxekibari.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/wosujafamarasusosubadogif.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/vezilawerekaziwefesim.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/bowejuvafejefafe.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/rukezotatase.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/41859979894.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/69097483119.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/27799523794.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/65215378869.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613268c940ef4---xuribevenizakawa.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210908195317.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/nuboxefanebozideve.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/76975213931.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/52079804473.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/4364077021.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/4952713413.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/ninuladizul.pdfIn PDF document text
    • http://jadeite.ru/images/file/sejamijoxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=music+theory+for+producers+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_off0000ae12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE12 10612 bytes
SHA-256: 9154862695b4a94127dbf4ee1b828293af701ff7ba13461c7817703fa1b51ed7
font_01_sfnt_off0000c682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC682 15716 bytes
SHA-256: 93524de45eb4543a098b2d10ccff31b4a5db2e5de787270b80bd9b6925a2d21d
font_02_sfnt_off0000ee5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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