Malicious PDF — malware analysis report

Static analysis result for SHA-256 4519a85f785cff04…

MALICIOUS

PDF

89.3 KB Created: 2021-07-21 04:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 37d00580f22c890d0482526419e2d17e SHA-1: 8c2b6f57e06ec9959c7101ed2e947afa7d9449f2 SHA-256: 4519a85f785cff04459cb11902d764a43a092c9ee57519ab9dd15eeca10f8e0e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to host and distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608768c87e8aa---44274898959.pdf
    • https://aduanaldelvalle.mx/userfiles/file/65797746418.pdf
    • http://eventechsite.com/files/files/63222308327.pdf
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/13213362165.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/jmiup7p3gqvg3896unklap3u5c/6424177014.pdf
    • http://bobiniauto.com/userfiles/file/86517362633.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/eb3bda3b71ce3c620f8952a6d9951b5b/94321212513.pdf
    • http://thetownsendfamily.net/clients/a/ab/ab79602242cca8f930cd52af13df1d51/File/beladiz.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094644819150---81529889457.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/628cadc5e3d5672cb0e51cac1bef9765/jabadinakenizavuvo.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160a715f9507d4---66113032377.pdf
    • https://0900107678.com/upload/file/10756374592.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609489ea6ddb6---3566646660.pdf
    • http://mtsp.by/userfiles/files/rakizaziti.pdf
    • https://at2-turbo-j3t.com/contents//files/22748415454.pdf
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/pafazivatutenavitewaxapo.pdf
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/51360978387.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/791d6f719042a35259cfe1f8f8a78856/tatilorigoliwidi.pdf
    • http://moristas.com/userfiles/files/mofabivinavizajawerox.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/6feaad309ece0f2bbca0de1a9643f66a/saluwif.pdf
    • http://oresteruggiero.com/userfiles/files/37667382244.pdf
    • http://daiichibus.vn/uploads/news_file/xobozugisivedi.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160869f65d81d5---lotobexijolidufuvodere.pdf
    • http://ahxxzx.com/userfiles/202107/file/77233737369.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=watch+pinoy+indie+movies
    • 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_off0000f9a8.bin
9c759a8ca55858bcf6490dadf1a2b7e5bd2063a4ada1527a6be2e043bed8f333
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A8 16932 bytes
font_01_sfnt_off0001259e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1259E 16792 bytes
font_02_sfnt_off00013db5.bin
c11bb621f989c36c1e300ec9d4c2c823cfb743fb59ffef6f66abfa97b47caed1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB5 10804 bytes