Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b1ca08c20741217…

MALICIOUS

PDF

80.0 KB Created: 2021-06-26 16:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 437304894a40683a7824933ec91dd5b0 SHA-1: 53e553158316bb636210a2d4dbbf6175efd43bad SHA-256: 9b1ca08c20741217fb2a76fb290de4904b4a0cd2d1a7e21ccdb8cf67c18ea98b
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document functions as a lure, presenting a "company profile template" to entice users to click on links. These links point to compromised WordPress sites, specifically utilizing form upload functionalities to host further malicious PDF files. The ML classifier strongly indicates maliciousness, and the presence of numerous links to disposable hosting and compromised CMS uploads confirms a pattern of distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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://nomylo.ru/uplcv?utm_term=company+profile+template+indesign+free
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdfc895911---monanexiwijifeja.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/3b36uk3a4atgr6e101rs84lifh/tagiwi.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/hvtm87a7s5s6utgl7vrvnoajg4/nituguxuwoluku.pdf
    • http://kraski-chernila.ru/resources/file/walanapodet.pdf
    • https://floraplant.gr/FCKeditor/userimages/file/dekuzefefukojibapu.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ad162dd6c8f---39924160494.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d4adf1b75---xefedabo.pdf
    • https://bestofbucerias.com/upload/file/90465966159.pdf
    • http://aire-limpio.com/img/editor/file/95559818741.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/orph634lcc55cibspv97okhqlv/kuzuvolatipemoronit.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607033cb320b9---58043333939.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbcc0b14b8c---tozuguduk.pdf
    • https://prosaison.fr/userfiles/files/zewumokogeju.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/224a20052b3d6199ea76e53a1f327706/61357116899.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7dc835151---44777060998.pdf
    • http://artospace.com/pics/file/84775278124.pdf
    • http://nessium.net/userfiles/file/18492444099.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/1e7sk82fpcvv63v6dja7sfen91/53934971385.pdf
    • https://planet-for-events.de/userfiles/file/nuviw.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab0172b11b---xapufefijo.pdf
    • https://chmelo.hu/sites/default/files/file/tewabewalubefowixokamuda.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160818d2687b21---87471896004.pdf
    • http://iphonedown.com/ckfinder/userfiles/files/31220133435.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608cb014e020a---83856737660.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab67ee625ef---43640724410.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9755f2ebcb---83649957679.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_off0000d28d.bin
4137210e2a3579059d94a1d10f0c8f4e1a05e9df3ff96d76ef77959f23e01fd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD28D 10988 bytes
font_01_sfnt_off0000ebe1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE1 16792 bytes
font_02_sfnt_off000103f3.bin
879b599ae68ba6ef4207fcf61d8017c80fbaf783cf680518a5ae975b20291acb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103F3 17888 bytes

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