Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3c394ae8edfbdad…

MALICIOUS

PDF

101.6 KB Created: 2021-06-25 12:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 48b36a93182fd37a3ccbbe7bcdfaa5ee SHA-1: 4c606bcf2b5ee087e6c323d9a3cea21f7bb1a2f3 SHA-256: d3c394ae8edfbdad7b6b94ad88e9187c776e9a276a62ed3400e3bc66a2e10579
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely exploits PDF vulnerabilities. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and link farms on disposable hosting further supports its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://allytemp.ru/uplcv?utm_term=satarudriya+stotram+pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160894b1318f0c---zidumigefelemofirobudiko.pdf
    • http://fmi.lu/userfiles/files/rogexigazifazije.pdf
    • https://sasalidayanisma.org/uploads/file/40402175110.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/779g2s67let7sp5k5ihhqn1cap/wonisamevuvurix.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c394102428---64622499284.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9eab394de---46484013798.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b89ac41dd79---xavijitegarijezetak.pdf
    • http://tuzvedo.hu/elemek/file/76527978032.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b35ff072246---funekotoviviki.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/5484dd0671c035e3e4f2ccc05faf29c6/meteripubipapifu.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084a3efc9df0---nopipusaxobukunefamerir.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/667a182a41bc92717102057b0b9441d0/rakudu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000129d1.bin
c026324d2838bcd776088cf76c8b0673003c4524d15bb816298274d43084d025		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129D1 18848 bytes
font_01_sfnt_off000157c8.bin
c834431e4803646f4d64c6a4119301595e8acb1e089558252aa9e6cbfba33417		 pdf-font-stream PDF embedded font (sfnt) at offset 0x157C8 10664 bytes
font_02_sfnt_off00017040.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17040 16792 bytes

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