Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc3d0b869ea08235…

MALICIOUS

PDF

84.7 KB Created: 2021-08-26 11:35:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 61e1de75f44b7c590fd41a05ff227a60 SHA-1: 388fd0b36579b5fcd50e5ee34341fb45a3e0e459 SHA-256: bc3d0b869ea0823560f9482995ea0e48376fc3504b5025aa4f32708f309d1f1c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the final malicious destination. While no scripts were explicitly extracted, the nature of the URL distribution and the 'Pdf.Phishing.Trojan' detection strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://medvor.ru/uplcv?utm_term=ministry+of+planning PDF link annotation
    • https://medtek.vn/storage/file/nugomapaso.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/18283518312.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d485fc510c0---baxovasenok.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/31029308854.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/i0rrc6plh0r00cbbd4ej400j57/23693268603.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/xuwagopi.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/66003020678.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/56118938770.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/90208925586.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/75677132829.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/daadaf1a90a25a1af52024b1e124348a/karedejejodenupirosuxe.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/1816053979.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16081b000d21ba---roliwuzafuxap.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/939ff6a896f3fd5ece35a9f6ddffbab8/96949133976.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/77461473361.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f21b87b84c---remuna.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160863ea23309e---23169961526.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3d536dce7---sufibanalaxosededuma.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/xijobutovo.pdfIn PDF document text
    • http://proxima-design.cz/files/file/kexaletomu.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075769de8cef---taveziwas.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf297d7c99---32080721225.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/23210790287.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_off0000e60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE24 10508 bytes
SHA-256: 48e7fc6aebf035c4568e1faac8c7968460fe98a998171719605b8b0b2d31c87b
font_02_sfnt_off00011631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11631 17696 bytes
SHA-256: c6d423ae81ab90d531f6e4bb8740018f7aa2ce749b70c0b156bf8275a36ffa9a

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