Malicious PDF — malware analysis report

Static analysis result for SHA-256 cffcba89045055e7…

MALICIOUS

PDF

98.9 KB Created: 2021-07-05 12:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5774ed6b7bbca2c77b3774d36923124d SHA-1: cce2bab75cc505159c433c994f7472f2ae717734 SHA-256: cffcba89045055e724636e6b5e4632d07dd5f38fd5f05140abcf066141caa845
156 Risk Score

Malware Insights

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

This 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, hosting numerous links on compromised WordPress sites. These links likely lead to phishing pages or further malware downloads, aiming to deceive users into clicking.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16088558875203---48146775212.pdf In PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083a5a04af2a---43923070537.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829c661f7f5---guwufemujazexiseje.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7b476fe85---dulajitizufijewebatebo.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/85635624950.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/buboparen.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd64c9dcb1---gutonixenukavax.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad92675843---52335571224.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/15126625473.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/tenaberaxolefiwuzabame.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/jbrqsloqvm0r0v35i68kp9ictt/didatesefuluzo.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/88b0f3d30272ffdef0a619fd716bbf2a/letufu.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/2284671cdb90458e154a8ba98f69c55f/wiponuredapoxokokokefel.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/e39ad001f2cea0aa5f58b064afd9d2b3/makubozof.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1dafef350---wubumutidawuwalo.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/gaxagesu.pdfIn PDF document text
    • http://airsoft1.ro/files/file/9671874368.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d351b2872---46371024657.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/vegojotujetilan.pdfIn PDF document text
    • http://tlproduct.com/userfiles/file/98625124600.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/62bac410b6ec4e874bbc72f95d455f5f/sejedem.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/15660294096.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abda20b403b---pimuzubogadupez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=my+6+year+old+throws+tantrumsPDF 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_off00011f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001378a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1378A 17036 bytes
SHA-256: 35c348cea62f8df1ccf7b992f8a06206b716d6e4cd7eff3e49d9ed9a8c87a9fd
font_02_sfnt_off000163b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163B1 10884 bytes
SHA-256: 11319fb3a27917747ad835fd3eda99a3ad54d82c621fb097bd26e5660d3f7cee

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