Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb84b889d1ec026f…

MALICIOUS

PDF

79.0 KB Created: 2021-09-20 14:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cded2c24696cf185a4903422f20b8692 SHA-1: aa276b4c6cd200c2276210e1ac7b3b316cb9995b SHA-256: fb84b889d1ec026fd7e01c801d4c4af8591c2585589c79ec91cc3885ea58d09f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=nang+te+malang+punjabi+song PDF link annotation
    • http://keitbg.com/images/files/12956181814.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/puvuwotididurarizow.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/40e34a0511dc6eb4f931af7443c9b984/75283540679.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1d3df1060---55433986036.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/jinukupula.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021922253536824.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/pelukesejux.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/31647432198.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/86952859965.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7205f28a3---lonoxim.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/tidigidigega.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/1486237697.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16136a83b999f0---53508076089.pdfIn PDF document text
    • http://balone.net/_upload/file///22049048190.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16134bf21e9571---kufabajo.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/10754468828.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/41199314547.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/94874427913.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614138ff7ad50---kurasuratejafujokagid.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/72105040912.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/wixosemunazewofub.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614224db64136---43593851755.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_off0000c913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC913 20296 bytes
SHA-256: 637530bde028efe460b8d49083826a2676326981fad72017bbcf785b60021ace
font_01_sfnt_off0000fe31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE31 10840 bytes
SHA-256: 8fd03dafc0e6e1c78ef412cdc5b04ea55c262744745070a46fcfd279a19e2f22
font_02_sfnt_off000116f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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