Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f543f97b32183d…

MALICIOUS

PDF

70.2 KB Created: 2021-09-14 00:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 185d5409d3c6b8c5f5d30c2c8b2c9770 SHA-1: fa436642c02879e9e511d149160c47f0ca20d45c SHA-256: 55f543f97b32183db974346190f36b219d309dcfe41f8fdf49eb2eaee832ae9c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many pointing to compromised CMS uploads or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6923

Heuristics 5

  • 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
  • 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://pixomot.ru/uplcv?utm_term=how+to+convert+web+page+into+pdf+in+chrome PDF link annotation
    • http://timandlor.com/userfiles/file/saviruwefavepijomefotog.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/tefefexixepuguwopomuj.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/jufikakorep.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/42c43ae75b02588ee7c5b99b5e5f70d2/87746868275.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/divudotemomuderuwojukune.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/ragigegovured.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d16616ad86---7468969234.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/83728429062.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/numoka.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/dexenasibedepidowitu.pdfIn PDF document text
    • https://digireg.dk/upload/79620243445.pdfIn PDF document text
    • http://gardatrans.com/content/Files/84983325339.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/1h342kj5l4nv58skmo31bfh0s2/41094564566.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/26521473674.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/voxajolifazedome.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/35259970049.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/70979623786.pdfIn PDF document text
    • https://deepex.hu/hirek/files/57196125000.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/12345049189.pdfIn PDF document text
    • https://mavibusiness.it/file/94208625080.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/92746703629.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613a22675479f---3958576655.pdfIn PDF document text
    • https://medbioplast.com/klucharnet/images/file/dokiwunuvawekeludu.pdfIn PDF document text
    • http://ipceurope.be/assets/file/28443584744.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/96161712499.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/42316971570.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/f4c17d2a976c316e2f0dfa0ae633a087/goralanafogu.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCB 11136 bytes
SHA-256: 5ab80e9c40e13e7006762c47f98d6dcd977ee79d60c22480e09f29d9771c78f8

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