Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a6331a9d40e6d0d…

MALICIOUS

PDF

80.7 KB Created: 2021-09-17 03:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2f758bbe2e2896eeef75c0d2550bb315 SHA-1: 567edebd3028f3e45afa9cdea8393356af5faec9 SHA-256: 9a6331a9d40e6d0da2bb48171b678caeed605d298ab3ca2b6d2ea9a7f4e0c1b5
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of a QR code lure further supports a phishing or redirection-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://laborke.ru/uplcv?utm_term=c+gamer+apk+download PDF link annotation
    • https://alpinashop.rudy-ra.com/files/fixisetu.pdfIn PDF document text
    • http://nensi.si/upload/file/pazilefirowojiboka.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210905_41597E389A3A3B57.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/2766518781.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20004262740.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd205487b1---fapobajudo.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/19268529593.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/xutobifano.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/delesogip.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/61702057913.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/balizep.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/33260572339.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/zuwazufawinefolix.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/bubofano.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613958ca6aa61---19823853777.pdfIn PDF document text
    • http://letdentalab.com/img/files/71842330417.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613644efc0e5c---8979927512.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/ruwejufezemuv.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/2316cf2de656bd717954bd07bc58eaa7/86666516430.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/79357018246.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/17946623221.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kawazofepaxexi.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/rexapejorugakomijoto.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_off0000d281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD281 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA98 10584 bytes
SHA-256: 451fada2f91a782f59669a4f05b4774db0c650ba7fb5e1f3b3ea1f55ae94edaf
font_02_sfnt_off00010286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10286 19032 bytes
SHA-256: 28d1e39f3a3a6ff03928d7832e217e53b1da8fd51df5306bd23020f471a7b686

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