Malicious PDF — malware analysis report

Static analysis result for SHA-256 820d4710224d7274…

MALICIOUS

PDF

83.0 KB Created: 2021-09-20 06:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4228f22b70a26bc9d9c1470d385695c0 SHA-1: cfc56a56d39b7715d16739fbe084b2f8b88fc905 SHA-256: 820d4710224d72748d7f6cda56900d8963af8a0ed03a076865886208a67734b1
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

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 https://nazrabilisim.com/calisma2/files/uploads/widafasolozaxe.pdf In PDF document text
    • http://parquet-cortes.fr/data/Files/waxoluwiliwiligawupozir.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/6953423095.pdfIn PDF document text
    • http://medrea.ru/upload/files/mewevanalibutu.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/xesopib.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/rukadokefosivorerazum.pdfIn PDF document text
    • https://12shio4.com/contents/files/bigow.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/86152255496.pdfIn PDF document text
    • http://insei.eu/userfiles/files/fewomuvutakepatugoba.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/pokejosunovi.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/56170872013.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/27212130142.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/pedumabojinijogujim.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/416880554.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfac043c6f---kupegires.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/dbf41fda474ee14f9462fe1599cb1b59/dikenufag.pdfIn PDF document text
    • http://calisnt.com/uploads/files/80631083118.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/fewovuxapinixalise.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16143edbe41c9b---8044356828.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/wemalarakomozusilanes.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/gugoxipasexovofakofef.pdfIn PDF document text
    • https://windscrm.net/files/file/zubejofisibix.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/161421ded5ff7e---34987629308.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137cc61ca907---daxemowimomewede.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/59487492693.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/dilipovuzinafewosem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=spy+call+recorder+apkPDF 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_off0000e130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE130 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF942 17432 bytes
SHA-256: cd164af4cb7515b48a9b6775d3b8dc4674114e6142895f00f90bbb03f695ff4e
font_02_sfnt_off000126e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E1 10324 bytes
SHA-256: dad013350591bfef8451be35b762073a00f864393fa93572a3d99c4f97f0b80a

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