Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d67f81ba4ce737…

MALICIOUS

PDF

76.0 KB Created: 2021-06-29 16:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8bb30c185bc8232111614fdd69716970 SHA-1: 055831621d88ccd300c354edad28c7c7049e8078 SHA-256: 19d67f81ba4ce737e675cde8e27a95ebfa0641aec1f516b058d107996748fe14
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true destination or to track clicks for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/iab2pckshju7fnh1v7vkglorgr/56306767853.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/63df93cd87664ea0e8001d9e94132539/dumenokuzuli.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/1f3e6b7d8a16c5426c3a06aebbc897c1/fisiw.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/qqognf28ub1bcdhvvgj1hnavjb/fifokexok.pdf
    • http://cloverdiamond.com/file/56392772860.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b048eda99c---bokepewedekuwujanoges.pdf
    • https://majorsagilekvaros.hu/uploads/file/jesevolivak.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/0354i2uc263euo1lnv7kkma2g1/79576657421.pdf
    • http://alexlunacoach.com/img/editor/file/xojobaka.pdf
    • https://oncallanatomist.com/ckfinder/userfiles/files/teganimosajudumokazutoni.pdf
    • http://htwy.com/upload/file/79656277589.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076dcb564bb0---62323299683.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/da3b04703ceabfdd033456851d51857c/81865802692.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/ebome4nieo5h2c5q21t2i1bh9t/mudinenusoxabadezebov.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7752c1247c---siron.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d789f4424a---sosodademage.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/35176fdaea3a7c426f4fc5567f3970c1/jilegigupabubolurisinura.pdf
    • http://kameleonhastanc.hu/files/file/wevabodibadeponiw.pdf
    • http://www.anjhimayath.com/upload/file/91515035357.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2476ec4eb---pifexurefutiribalo.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/1fcltrm54n07vecqmtt4pd32mp/gatadu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=yummy+noodle+box+palmerstown
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c486.bin
2be4048b099241c0285e2e1aa6177f05fb11cfba59787746296f23223e909ab6
pdf-font-stream PDF embedded font (sfnt) at offset 0xC486 10984 bytes
font_01_sfnt_off0000ddea.bin
bf656e65cc91d6f4a5a8e79c4410463195d050d5582e8af95a7247dd45d7187c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEA 17228 bytes
font_02_sfnt_off00010af9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF9 16792 bytes