Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d92a18f82ee10fe…

MALICIOUS

PDF

85.3 KB Created: 2021-09-20 12:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 05aa5e212cf40e63611429e29c047552 SHA-1: c864f616e83794e0a819baad33898db4171dc4a0 SHA-256: 6d92a18f82ee10fe209358a729bd8b2ec125c34bd3621a782f4b7f82ca174780
164 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous external URIs and link farms, with several pointing to compromised CMS upload directories. The presence of a 'download button' heuristic suggests a lure to trick users into clicking links, which likely leads to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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://philabc.ru/uplcv?utm_term=compress+video+di+android PDF link annotation
    • http://exito-opakowania.pl/userfiles/file/27379563060.pdfIn PDF document text
    • http://mamitobe.ru/files/file/15651753563.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/dapibobudanafi.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/50421713125.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/nenibuba.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/gibosode.pdfIn PDF document text
    • https://bnovum.hu/downloads/28911401361.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/68116907109.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/6ed7950a052f4b0a2bd7dc5355d212d1/23015481476.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614255fde05b1---moxoxiwamomaxob.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/wowubewikawupamo.pdfIn PDF document text
    • https://pisausakti.com/contents/files/44614189753.pdfIn PDF document text
    • https://123natura.com/stockages/files/dujakolurukugazuzamamum.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109101634071649.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/32318383018.pdfIn PDF document text
    • https://polytex.de/sites/default/files/zexajivubemiketerag.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/57755670012.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/komesewenikonawo.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613951f7cbc9b---gagagafopor.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/58248141827.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613172f8add65---fawesabaruna.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/jozipewibadekokaranosek.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/migataxasaxaz.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_off0000ea66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA66 10508 bytes
SHA-256: e345c995f013c81958ca056db170c8ad85f77e2170a84f8edaacf9d1adfcdecd
font_01_sfnt_off00010244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10244 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A56 17472 bytes
SHA-256: ab1d200d6ff0ec724cb46114aa938a5f34f2a66078206379d6ca62037d82d843

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