Malicious PDF — malware analysis report

Static analysis result for SHA-256 f449e9a654a550f2…

MALICIOUS

PDF

92.0 KB Created: 2021-07-24 11:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd6c500bde5bbcb1867cb31708ae4b4e SHA-1: 422c84303e68d8211dc80fc13d1f851c30096fcd SHA-256: f449e9a654a550f282c5979fd5d5679bb8226c75b55247d816ebd596f9ada130
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links on disposable or compromised hosting suggests an attempt to distribute malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607cef41c9f48---wuvuxasoligezovev.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/a9a581297a26b7f699e68787b8b06e8b/36248905811.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4ae83fdf5---37118257667.pdf
    • http://mnogonomerov.ru/uploads/file/57852197459.pdf
    • https://vegan-eshop.cz/data/file/24997748076.pdf
    • https://krono-original.vn/Images_upload/files/jebunupu.pdf
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/85927604339.pdf
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/vaketoza.pdf
    • http://accessiblevehicleservices.com/userfiles/file/buxudabinefegaseberamox.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16099cdc2defb9---ledopusatopagumowu.pdf
    • http://cupta.org/userfiles/files/20210724105959.pdf
    • http://shqinze.net/admin/upimg/file///begemedoxof.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/426dd3c08f97a364f01dc217993f5383/xisisuwarumiritovumi.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a995eeb4dd7---zasepubupirev.pdf
    • http://washchienluoc.com/upload/file/70627240731.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c997dfbeb1c---xoloforetifu.pdf
    • https://pensiuneavalentina.ro/app/webroot/file/34016484516.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/036ad351cbcce4a5fa395e4895f29764/96724415612.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8b120ce2f---buladusupobexego.pdf
    • https://bd-sokolovska.eu/userfiles/file/mojuli.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/fd57af357fe0fac4482563cfcc51aac1/zazekejurabukavosiz.pdf
    • http://www.europesolidaire.eu/userfiles/files/xibuxidemuviwomegatifem.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=emergence+metamorphosis+bahasa+indonesia+pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7e4.bin
6be1215e457d47903753d3d882d54d4b22034af44d74bc1726496203fd18ffaf
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E4 17856 bytes
font_01_sfnt_off000125e7.bin
837b8314cef9dce20ef92b72a82c30ec572742601131d49c603ea65b350502c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x125E7 11144 bytes
font_02_sfnt_off00013f45.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F45 16792 bytes
font_03_sfnt_off00015752.bin
2420d728e2ae14304456b6f81074edb92e82a125dfeb4510a5f5fff3bb864d67
pdf-font-stream PDF embedded font (sfnt) at offset 0x15752 1996 bytes