Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0da091ce8206380…

MALICIOUS

PDF

94.9 KB Created: 2021-06-29 08:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ecda6493758f521f2007d6af80f3ae36 SHA-1: 3c403fef572e4d00e5a9e59387adcc99e7102d62 SHA-256: b0da091ce8206380cf28f7d1e8394dbe1e7eb7ba4f7de71e23240e3c500f0f77
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, many hosted on compromised WordPress installations. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://wastran.ru/uplcv?utm_term=social+studies+interview+questions+and+answers PDF link annotation
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/0e3c990cd531dde828348163af578222/guluguvupi.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/11834660385.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb90a10a6c---fufuxijugupaguninisuru.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/44674355748.pdfIn PDF document text
    • https://dhcom.vn/userfiles/file/rifopavate.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/0881bcea92fb67e2ae8ab23d69c480d1/pedomov.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b01f197ea81---ravekezizesenizumiju.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/60272ea38da4f2dc10a01ebbdcaa75bf/87291295211.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b243393d2---29063231346.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086922c2b7c9---nonudoke.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/op7j318h710it66hpdtnlbin6r/figuzopotajobojinug.pdfIn PDF document text
    • http://broorybulldogs.com/clients/33993/File/59613763457.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/db27161f963d649dfe4b92e1e9f09e7b/36053415051.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/4ft4hdr2ke2nifif3da0n8g5r5/xemijeba.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9aa274f8f0---fegurano.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/59215683094.pdfIn PDF document text
    • http://learningkey.org/userfiles/gigoregujarosevirom.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/88512893687.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16075ec0e3a2a8---vasexokapelapobumu.pdfIn PDF document text
    • https://506hlapeta.com/files/file/magisidazuti.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b2d4dc490---70661312225.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fdebd1234---morukewinasixa.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9151f505cf---nugobanejijejomujanis.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_off00010de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE8 10836 bytes
SHA-256: 5347a8756d9b8cc121d62f801c5f070d20597731a7ce1f4075aaa39691a0dd26
font_01_sfnt_off000126de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DE 18068 bytes
SHA-256: 622eb30cf94c2c78d0d3d1122167491686e0602223f6665f5f2b5f18f8b17eaf
font_02_sfnt_off000155f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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