Malicious PDF — malware analysis report

Static analysis result for SHA-256 df5f3f04f1bce01c…

MALICIOUS

PDF

82.9 KB Created: 2021-06-29 06:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f0d627efbbb3ba054284dda2387f45c6 SHA-1: ffe723bd9997fd1b168ab3cc5db104bcd5087963 SHA-256: df5f3f04f1bce01c949566250fe47ba121cb55ad866980f8dd529a0dce499c1f
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites, suggesting it is part of a phishing or malware distribution campaign. The presence of a visual download button further supports the lure to trick users into downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=tale+of+nine+tailed+episode+14
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/978fbc41e78accc3be194bc780484f2b/xufovedesa.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/iouvjf6jf8t661gi4rls1f47as/zabeles.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/794e3344b53010b3a299d1107eb735eb/86483802116.pdf
    • http://adamlegal.com/userfiles/file/37530352835.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/ea96541a104d0f65907f588ebc3e8bef/fevatazelelukej.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/2b400548ac67d0e3c0842c854dc05879/nazaremuxo.pdf
    • http://alituncer.com/userfiles/file/kirarivubezu.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609347d9cafc0---55514296416.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/3kvqrjn6dq4ck4ulot4ffrct24/jufepasetot.pdf
    • http://a-daily.jp/app/webroot/contents_img/files/vamuwidolu.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/81de58102e78e66cea5f724389ab4ef8/gavitofatuvav.pdf
    • http://aisef.org/uploads/userfiles/file/file/42593543902.pdf
    • https://aradovan.com/userfiles/file/91756573657.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081356e2aa0d---sexolidemuromaduzew.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5baf27cf20---maziwotavuviniwafamid.pdf
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/24371461668.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7472d3ee92---ximazeriwoxiwos.pdf
    • http://akinmedikal.com/uploads/file/raguwedenojarijubakumij.pdf
    • https://marljivo.hr/userfiles/file/sabur.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8345c7ef3a---molukarujupula.pdf
    • http://bjbtrh.com/files/pic/file/11235195681.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e29d.bin
c755bd0277925d4c0d8be091438a60fc1e6c9690cb71ee6deee2930b366d6226
pdf-font-stream PDF embedded font (sfnt) at offset 0xE29D 10484 bytes
font_01_sfnt_off0000faa6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA6 16792 bytes
font_02_sfnt_off000112b8.bin
9714f5c7d2e1011d76aedbea483793bc3c99a5223528c883cb72247b53354223
pdf-font-stream PDF embedded font (sfnt) at offset 0x112B8 17024 bytes