Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecc8c0a9e13f81a9…

MALICIOUS

PDF

75.5 KB Created: 2021-09-08 08:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9b7e59655b91b21a1adc56dfdd24c5c3 SHA-1: bf29fecb4ab81c9a274bc7f65e7f9e481f21b439 SHA-256: ecc8c0a9e13f81a94a18757a16e5ae1247d9a0c68293393e5b2a8a8b326d18d4
156 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://stonebreaker.at/zawawizugusibulovibaveluw.pdf In PDF document text
    • http://unipsyclinic.com/userfiles/file/20210509230835.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082442ce8b24---fegaforeborakinimilak.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/85d09b6a7a92bd633335d0d13f018779/22072764931.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/29396454308.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/va8qtva0vp7t5e61hbos5cotgk/zabogorumodamitefuxetuboz.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/f50ada81985ca4b6d11feb4b711b7415/66106778820.pdfIn PDF document text
    • https://immobilgold.com/file/nizesuzopepidijekipevix.pdfIn PDF document text
    • http://texmet.pl/userimages/file/63105067141.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16088884139ee3---58893884674.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/josepawazedazibamuduzumo.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/fubotam.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/d4baae84818a5db6e65ea6b685c95c5e/zapenoz.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f0321b947---88529689623.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/gefukilinakuvugenekew.pdfIn PDF document text
    • https://indianpowerliftingfederation.com/userfiles/file/26000403856.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607db0057c587---tukiwabum.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/rewuzitovinedami.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/jepogenetupemulexuni.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72a9ce0adc---72392486364.pdfIn PDF document text
    • http://ubest.ru/images/file/84342509882.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/rajenedo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=stuck+up+suit+pdf+descargarPDF 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_off0000c410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC410 16844 bytes
SHA-256: 016ece8d2e358a473c8637d194c63c2e8b1df0ebbb7f1d2a979be418b5b71823
font_01_sfnt_off0000ef40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF40 10792 bytes
SHA-256: 13f81afd7a8723b6f107bc272f34bd06b2c7c5f0b9cc1fc38a38c1ca11ef3007
font_02_sfnt_off00010819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10819 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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