Malicious PDF — malware analysis report

Static analysis result for SHA-256 4be0a4a4d4e6789a…

MALICIOUS

PDF

86.8 KB Created: 2021-10-28 00:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 329a5073a2adf6a33e1c9f7c5e12d38c SHA-1: ea63d5abbba5f7a4a5c266d43178b1b95849af40 SHA-256: 4be0a4a4d4e6789a396ea989c494130e7adbdbc5ed0c8e5d25823058d054f223
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of external URI links and compromised CMS uploads suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://vxclouds.com/userfiles/file/manal.pdf In PDF document text
    • http://4998horo.gmmwireless.com/contents/files/84695867580.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/neraxekotut.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad4d97a9d5---jupasagepakemalosij.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/34357071279.pdfIn PDF document text
    • https://epm.jot-solutions.com/files/4559641595.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/nafamibom.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/88714113269.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/pilizupunizejomisatofip.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/fepemulofonofumisufotofok.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161757b3071430---10193724759.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/wejujemenosekorexo.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614df315afa3d---90763806877.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/fesarusavasirelumi.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/nodameziwif.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/rupoxinivatofedepo.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/34090092409.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/76e902f9621f5d7199b905ab1cc7a8a5/kiwiwijezitekitelasix.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/jodidodaxepubadon.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/10626186057.pdfIn PDF document text
    • http://capital96.com/userfiles/file/vivepagixobilamujufodom.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20211028_012931.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/55548670572.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/fedix.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/sewedarolowepenenuxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/896FEnmJZlk/uplcv?utm_term=hltwhs003+maintain+work+health+and+safety+answersPDF 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_off0000ed2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2F 17496 bytes
SHA-256: 93245b3bf20d7bc2b1d40a997c22606b006cfa8a29b923cde08d630cce27c1e6
font_01_sfnt_off00011a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B0 11196 bytes
SHA-256: 26c1de0ba23ef0a0681bbc9429c2690911436be33a238d57940d15b360bfc50c

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