Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fe6a7391cd95526…

MALICIOUS

PDF

84.5 KB Created: 2021-09-23 06:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 30767e989e644524d29fbe26b6cc7c2e SHA-1: ed369c33997d211f088b1f94811de250c677cfa8 SHA-256: 7fe6a7391cd95526e5954e11433024da5e865f8f55f4ba39ea328de6cef4e88d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://shevian.com/images/file/wosowipabevumipenib.pdf In PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc6aa5101e---58442252773.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/25743884303.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/45983748018.pdfIn PDF document text
    • http://electric-kernbichler.at/zodadetil.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/pukegofapegikeviselara.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/42488665170.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/bufadufunag.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/niratedixowuf.pdfIn PDF document text
    • https://fasleh.net/Files/files/68647276177.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/zovugazexabadede.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/86250773596.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/gipojopuvekajuwubelizol.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021091818571612.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/bifivuleg.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/58455195328.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/742ea1be727a619008497e8d4cff5dbb/57913228496.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/23206477345.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/19930621232.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/09vm7o7eivt5t6sroc05f3uhf3/634936042.pdfIn PDF document text
    • http://meta-min.com/files/newizatejizedaxodu.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/93087286473.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/94267792990.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/mawufodozuvewuxuxega.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/zawasemedesevuxekajes.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/tarisurexilelawunutif.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/68691354566.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=gta+liberty+city+apk+downloadPDF link annotation
    • 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_off0000e078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE078 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88A 19316 bytes
SHA-256: 7e0befe8ccd525ca4d855c019a4ab50cde1137e72b1174090eb9ca948f9e4f24
font_02_sfnt_off00012add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADD 10812 bytes
SHA-256: f5afbe5e67a7505372970cf7fc4fbc37723c78330cd5216af9663ccca2d5d9a1