Malicious PDF — malware analysis report

Static analysis result for SHA-256 44bd27a4ce58f73a…

MALICIOUS

PDF

80.0 KB Created: 2021-08-06 17:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 67deb45d36b9bf5d070f6dfc25e0b5bf SHA-1: b33931d1d2db044c29cfa413fb117e3066012fc1 SHA-256: 44bd27a4ce58f73a0f69ae358dbd357d87a843477c7709424082a14a46e78352
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. ClamAV detected this as a phishing trojan, and ML classifiers also flagged it as malicious. The presence of multiple external URIs and link farms suggests an attempt to distribute malware or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5897

Heuristics 5

  • 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
  • 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://starwindows.ie/ckfinder/userfiles/files/donawamupukugutosigugitum.pdf In PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/65279826019.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a0cbabadb7---katedumewiwix.pdfIn PDF document text
    • http://2021woods.com/clients/b/b0/b0e6999751250b7f6f06d89f33415bdd/File/79694800617.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/zojosifonijezuwat.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/10738735091.pdfIn PDF document text
    • http://nakatka.com/files/file/90490878461.pdfIn PDF document text
    • https://roc.mn/uploads/files/96134282911.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/l1fdnvbt58m2avpffs7tfa6gq3/vokonaf.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/vulowugatixefurabu.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160cff1dae14a9---63361664930.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/3e760ebaee010a48b5c8c0ebf946b1d9/gefakusifilewonune.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/b5fmampo0q7gq0dvd7cvtlmkd5/22066748950.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/6de135e8a7a2b714b00426bb694e906b/52228032976.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ef964aafc---91019851593.pdfIn PDF document text
    • http://efrex.cz/files/file/50632642848.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/52603500700.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/3b394617abb21956a26ebb7d437ad615/11227077215.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/edbf3b9c96d2b3c3265ceb075625b815/78541931936.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/83b8fc222acf8c520fc5018a20718ea7/76174740785.pdfIn PDF document text
    • https://digireg.es/upload/wibonogepanuxurirufageje.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/tomabujov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=best+free+online+multiplayer+android+gamesPDF link annotation
    • 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_off0000e8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DA 11108 bytes
SHA-256: 53cdc9fad293728650e6b659c6bda4707bd4b4b835352c548533ecdc63292845
font_02_sfnt_off00011a92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A92 17068 bytes
SHA-256: 7372fb14887fb734034d6b8448af364e9355790a9d0283ec9c39fc66ed790f0b

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