Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc41de06740b1c98…

MALICIOUS

PDF

93.4 KB Created: 2021-09-05 10:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1cd809d044b286f4baa69eece6e13437 SHA-1: 28af5190a2197f6b28c47c5497a4207d8c7d8607 SHA-256: fc41de06740b1c98d5b1e66a5471699c7cc96c22001883718a7643617ddf0598
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to multiple external URLs, several of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160af0b6160d64---43095233236.pdf In PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e4090dca3---nefipuneroximejejowomew.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/70502802702.pdfIn PDF document text
    • https://baglab.pl/galeria/file/33339559620.pdfIn PDF document text
    • http://synowka.pl/galeria/file/febezujuk.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/26135711016.pdfIn PDF document text
    • http://edumedcare.pl/upload/files/vatowakujikuvoditewube.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0d35bb61e3---talebenumolurokiwogep.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/4o5vtc5p6a935rrp2u0e96m8ra/63860406701.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/f6996f228977dbba00985b13c0266b7c/tiviwajovasodivodutavewod.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/60944924890.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/t0omh875jk9l123caeogeui1mu/41115591178.pdfIn PDF document text
    • http://hortherbpublisher.com/files/upfiles/file/62519956425.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/bajivazeve.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88c8ac64ba---nuzabekemixewatuduje.pdfIn PDF document text
    • https://p99.tw/pro_pic/files/85056210520.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-07-19/images/files/kelerinasebadisabamomor.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/fge6bo3239kj0g9f4h9kdqqmu1/19955829906.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/vipepowadetisasakulun.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/sibinagagi.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aea2c132aef---10732459087.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/68017440531.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=cover+letter+for+housekeeping+job+with+no+experience+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B4 17556 bytes
SHA-256: f494d4fd8b8c717fdf9aac08b639e5ac3ba02b819d55396ebaa363fe42c64a4b
font_01_sfnt_off00013505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13505 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D1C 11484 bytes
SHA-256: 5c144f745bdc457e63143e2288e76828fc1a2f4e5476015f0040a1a881b57e3f

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