Malicious PDF — malware analysis report

Static analysis result for SHA-256 669f366eb8601417…

MALICIOUS

PDF

77.2 KB Created: 2021-06-27 08:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fbdee06836973b7d4312551d98b0bd04 SHA-1: 886417b08217fd7f12d3528b96f4ff737d0972b9 SHA-256: 669f366eb8601417a55c81b70cd85851e7f09efa550c980dfc45d2d0a970d981
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to compromised websites, suggesting it's part of a link farm designed to host and distribute malicious files. The presence of a 'download' button lure further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f955d6c3a0---70958206500.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/58765349362469a2ee2f0feb05586968/repixifazeseje.pdf
    • http://learningkey.org/userfiles/87609887784.pdf
    • http://ore-processing.ru/d/files/lenunakuxadudepatefij.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d8a21f4a7---vimozaduzolokijobusuzivik.pdf
    • http://crosswaysrecruitment.com/userfiles/file/1513546404.pdf
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/damulipoxivusasevenapos.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a638d55eab0---kijejotavefivo.pdf
    • https://samarpanbharat.org/trila/userfiles/file/32074330896.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d197c515be---budusutefarerilapuro.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/givebirikeno.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c15578709---2688056312.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-6-13/20210613025423791864.pdf
    • http://allnatureint.com/userfiles/file/pabozexajefepirexanibe.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af33237762b---jigezoda.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d95a04c18---xavowujaza.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d8a405862---warevizawikozavewe.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/1e5jagmo1hv5631avig1s8ia22/86929540422.pdf
    • http://m4klynchburg.org/clients/3/34/34420611de4c9c7593cf5e5fe12de6df/File/dozukidegasisibibafixamo.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c9401174d---nurega.pdf
    • http://nguyenquangcomputer.com/upload/ck/files/gadopujukuwuxurebiviwexu.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a5a2ac615---duzututeri.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/0634a17adf6ef1a57f2df278de01fe27/rovasuz.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/569aec223b37f5b6f6e6dfa41fe7e938/redowosamuvorizujifinirum.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=convert+pdf+to+word+document+without+software
    • 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_off0000ca1c.bin
8cae0c0650a4bbaa38180dbe1ff2c92c95508862b068126ec06525aa98424ae1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1C 16504 bytes
font_01_sfnt_off0000f516.bin
7f238af4814847f738ca8b57d6aed240314ec0dcc4cbfce934d22bbf411c0dbe
pdf-font-stream PDF embedded font (sfnt) at offset 0xF516 11124 bytes
font_02_sfnt_off00010efc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFC 16792 bytes