Malicious PDF — malware analysis report

Static analysis result for SHA-256 c829a6a98164d4cd…

MALICIOUS

PDF

87.5 KB Created: 2021-08-16 12:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6186bbf6ea5578d748679530d1faa630 SHA-1: b56cfec6218193437a66e19624062fff48178927 SHA-256: c829a6a98164d4cdc46f6a8c5d95aaca23392554ee8632fe1c854613b1f9060f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous external URIs and link farm heuristics, suggesting it is designed to redirect users to malicious websites. The presence of multiple compromised CMS upload links further indicates a pattern of hosting malicious content on potentially compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://queure.ru/uplcv?utm_term=how+do+i+mute+my+frigidaire+microwave PDF link annotation
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/8dac0ec68f596fb62577cb0d0d160378/57329329972.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/6fa36f31a6d11f3230d0657779a19e2c/43433557808.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/likuw.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160885f91526d7---timefala.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/94289422339.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/damezabev.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/7f828a126755e5553e9d9325ba776beb/63138711197.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/kerojagubuxoxapomibi.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/jenokaxa.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/loridanogatanimura.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/12217848026.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/lekevukofokugesiburi.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742af58503c---sorolefixexagefupugiwat.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/65019751958.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/fedajekazogadi.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/19627191566.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0ebd9584f---67284596553.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/13968739607.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609de15d2afc1---kikisozozogitiru.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713d96af669---xevipakozonusaniwizet.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f9d0c5f66---murijebotawevaxapoxabipe.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c1d19b49f---tatutaku.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/dotononogotetawukakenen.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/kusojorigurutekivaj.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_off0000f176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF176 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10988 17120 bytes
SHA-256: 571339c4b5a4f1f4c2da30f689eedc1134f79e667de3bffb7b3fff20d2ac35fa
font_02_sfnt_off00013658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13658 10860 bytes
SHA-256: 2a46019954f146a132938a5df2c2aa529673ee3714cf9daae46246fce3a07e68