Malicious PDF — malware analysis report

Static analysis result for SHA-256 744f4093f1bb17d9…

MALICIOUS

PDF

95.8 KB Created: 2021-07-01 19:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d2400dae4f39c0a7f875dde9e51d959e SHA-1: d3158cf74c9d10b02c0b84d285690ee1c957abc3 SHA-256: 744f4093f1bb17d9da0281d1d1520de01ff3fb9d2581b18d1b3cff33b6965aa4
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other domains, identified as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f7434fb28---sigopanogifelagoxopidovu.pdf In PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609424aac08a4---33698181541.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07e09d24b6---sunajo.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/24bf99585aeb13a33a4a61344cda9b85/86313487949.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/55280811230.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2e029a1de---nimejevaw.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/wixebuzalenasirevubi.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a818ac1e1ab---tabezebupudorabeno.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/a4a2b9bac8121e35736d46eda70eef59/kufibenosodofibitelumudaf.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/35486532470.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/816313f6cfa03a9df10138e3fbdb794c/23417269885.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b5c9388d0---denosidapitatuf.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/baxelofuvugiroxunug.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/e0d57d5227fd2a6c01393d82977ad22c/joboxo.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/86230273330.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/deeedc8e05f1052ff48f1bac02f365ed/90124763116.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/192297bae81c9fe57e320cf9b351f60d/21528616292.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/dukusodabeditexufusiratug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=a+principal+purpose+of+a+letter+of+representation+from+management+is+toPDF 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_off00011588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11588 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9A 16444 bytes
SHA-256: edb6bcc92402ed801d3049c9d8e41bbe941e7b1bf174fe9185839829e79870b3
font_02_sfnt_off0001582e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1582E 10904 bytes
SHA-256: af92fa25be4d4ce3fa05f0c86fe61004b8a1e94186ef16caf2083d054665cf34

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