Malicious PDF — malware analysis report

Static analysis result for SHA-256 1db69bce503992ae…

MALICIOUS

PDF

81.4 KB Created: 2021-10-06 14:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e1db3ff50d40e701738a8f0ffe1368a8 SHA-1: 4ce8479932ab2ae244ce1084a960b868a77452e6 SHA-256: 1db69bce503992ae9998f82c20e634aa43f197ad3172b1d61d14c8720f192984
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://ooobelkom.ru/ckfinder/userfiles/files/vasakitotoxamowepoxun.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145ef855d3ba---kozeruge.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1615b08f36ba18---vafifovoxux.pdf
    • https://fiberglasssupplydepot.com/userfiles/file/dedetusu.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161343220dff77---rorasezozasones.pdf
    • https://horkolas-gatlas.hu/ufiles/file/14625847188.pdf
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/20137551353.pdf
    • http://palakkadtourism.in/ckfinder/userfiles/files/reserezulilunifazuzatan.pdf
    • http://whipitleather.com/userfiles/file/vefofijekiwaj.pdf
    • http://plechotice.sk/tmp/file/pakus.pdf
    • https://guadix.co/ckfinder/userfiles/files/33874167021.pdf
    • http://autosvilar.com/uploads/ckfinder/files/xunavuzejobanakomonevo.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615ad74d785eb---mopenexemiselofus.pdf
    • http://wenxuezj.com/images/File/tegalul.pdf
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/zelixilijawoxolatoluk.pdf
    • http://17njl.com/userfiles/files/xijelexevokiwuwimako.pdf
    • http://speckletrack.com/update/editor/file/16072335216.pdf
    • http://khonggianxua.samdigroup.vn/app/webroot/upload/files/gokujojidejowijideli.pdf
    • https://eguiders.com/uploads/xejemuxagonitameraxes.pdf
    • http://sun-green.nl/ckfinder/userfiles/files/83931659498.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/bf39pt25rf3f9cd2psrsgvbvgbivaodr/sigoperedaxafo.pdf
    • http://1111.morefriendship.com/upload/files/fedeniga.pdf
    • https://marblo.com/app/webroot/img/files/65237375611.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=86+kg+to+pounds
    • 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_off0000dc19.bin
5afe4204a9c6c33765fcb439119df8edbf93cf3aaed1366aed09b0cb16a0198c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC19 17080 bytes
font_01_sfnt_off00010858.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10858 16792 bytes
font_02_sfnt_off0001206f.bin
7ed6bc6dcfff130132da5cdb3bd6b39c646170c31d0ca67027dd9272bb723ea8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1206F 10504 bytes