Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a6be0011ca35a9e…

MALICIOUS

PDF

78.6 KB Created: 2021-09-06 16:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9d072ca92941b2a99158046dbc3f2cf0 SHA-1: 7f9d75dc7dfe7bf8a81d52d61c76e9dd5fb6dd8f SHA-256: 3a6be0011ca35a9eaf4dcad8176ddb7d2d32cf5c24c3ecdecfdfe77713405f86
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. Heuristics indicate the document functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. These URLs are likely intended for phishing or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://infrive.ru/uplcv?utm_term=power+surfacing+solidworks+pdf PDF link annotation
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/40c317ef44571c6ab06cddb2387db0c6/52134399220.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe4417e083---jibalokesofusopawe.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/078ee01399ae935002581e8d801f8e88/71090508666.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/gatasoxowesovaxugezevefur.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/7621266855.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/vemunewitajamabovimixikos.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/67028375203.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/7a8a05d5fc2783c61cdba43362c6759b/dodazibo.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/96751878396.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b44a9117d47---witaxak.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/70c422a06eb2a54dff44ed3830531709/29606125668.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/8936846709.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/78742233319.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b03fe5e7d13---62234870484.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/77435236405.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/apjhfn9kn2n4njl3ssvm67p48g/pufuloropemim.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/d7e59df3835a424187e331477bed6660/98139718623.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/pivuvewaxegumef.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/mozojiruve.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/790d823de5789f3f3226418b8804f119/93893132055.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/23608988881.pdfIn PDF document text
    • http://hutergroup.de/userfiles/file/womoxinuzuganewuwadodu.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/gorur.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDF 17080 bytes
SHA-256: 9601cf443505bcd982e94d1840bbe71a95748c96956fba096f91daf30bb00d7a
font_01_sfnt_off0000fb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11318 10976 bytes
SHA-256: 59a208625afed12b6dfbc475ec2dc55255ec95787e6202fc55797ed235603816

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