Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae9831b82daf0498…

MALICIOUS

PDF

79.7 KB Created: 2021-09-20 05:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f2bb702f2d98d7cf0b392ffeaac4a9dc SHA-1: a2f8d2002a01d32a8a7d523a8e06a29091fa9bc2 SHA-256: ae9831b82daf0498176d228f8c1dc59ad6dd35859e6a1a50d19e2a2300415257
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to unknown or potentially compromised domains, suggesting it's part of a link farm designed to lead users to malicious content. The document body is unreadable binary data, offering no direct clues to its purpose beyond its PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://shbaicun.com/userfiles/file/2021091413292173499.pdf In PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/dujasomirirefobixidifosek.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021091612512_259125866.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/8710038110.pdfIn PDF document text
    • http://boldogelet.hu/media/rederidexisujanesabekotu.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/76102322762.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/77826574362.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/tuputurap.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/2926470004.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/kelixagodomeremidafav.pdfIn PDF document text
    • https://rjpexport.com/files/terosowoguguxofeg.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/nemarikarasafiko.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161396a9580e46---81280822307.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/311337746.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/86601813806.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/jexolon.pdfIn PDF document text
    • http://canadanur.com/resimler/files/22560221716.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377196762b4---fanesizuxopinaluwavog.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/26538353120.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/rajilomixoj.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/94174279652.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/d1c7806cc23275b20487b6bbe16a2f1c/nosowudazuzisaxuvo.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/67691150911.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba5e93e040---xapapawemibamezojata.pdfIn PDF document text
    • http://workontext.ru/media/file/sikebelemusaruvuwixira.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/33634938568.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=death+note+1+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_off0000d4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A3 10240 bytes
SHA-256: 9a1fc3b42efc45d25649b1e9d6c242160a62ffd32fc7dd15b2bba2dbf113fee3
font_01_sfnt_off0000eb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB94 17520 bytes
SHA-256: 62b89e6a4068fec95576a91b4f742a8e7ce7d0c66ee5c69193054013d40adda8
font_02_sfnt_off000118e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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