Malicious PDF — malware analysis report

Static analysis result for SHA-256 b868e5480251550b…

MALICIOUS

PDF

79.8 KB Created: 2021-09-21 03:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5cc0d69e06288a41e1f13e7dab866814 SHA-1: c47e478abc3dbac20106305820918b54daa46af1 SHA-256: b868e5480251550bf45c483c67af93456fafd75762361ff40d32508aaa7200ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on potentially compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. While no scripts were explicitly extracted, the nature of the URLs and the overall detection suggest the PDF is intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://oniceh.ru/uplcv?utm_term=moto+g7+system+update
    • http://www.aragonemprendedor.com/userfiles/files/94034696834.pdf
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/82264517615.pdf
    • http://seattledesis.com/fckeditor/file/rabagifuvisar.pdf
    • http://metabolit-plus.ru/files/file/30383719518.pdf
    • http://parejalecaros.com/adjunto/upload/fck/files/45429516954.pdf
    • https://salondumariagededijon.com/userfiles/file/62350473031.pdf
    • http://alfavs.eu/userfiles/file/vanezenegipabuse.pdf
    • https://exihomes.com/userfiles/files/pedozexorimivunikazokodot.pdf
    • http://studiocalderini.it/userfiles/files/gepusitoxeropolekifem.pdf
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/vosewet.pdf
    • https://regaluxiluminacion.com/uploads/assets/file/12798619743.pdf
    • https://raselapp.com/userfiles/file/vinilojofirosejejal.pdf
    • http://studiofagiani.eu/userfiles/files/81152638281.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/74bfb3ed8773e4d1cc294d72ca9d05ed/78160442183.pdf
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/55680285487.pdf
    • http://hiroi-es.info/yamituki-n/uploads/files/55545291847.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16147477ff36ba---6698770865.pdf
    • http://asv-solnice.cz/_files/file/52357580254.pdf
    • https://allora-tour.by/var/upload/file/10281289480.pdf
    • http://stefanourso.com/public/userfiles/file/kudavodapokerus.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/tkpf7pb36hq4p2j6m1jvbts202/35208667953.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614408fd6bfe5---98092768809.pdf
    • 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_off0000d24a.bin
54a95274f55793552a813f7b813d144f5ba800ae268f3da3b8eb956c01278508
pdf-font-stream PDF embedded font (sfnt) at offset 0xD24A 18160 bytes
font_01_sfnt_off00010166.bin
55d87ae08a1e81a33b3deb9959117e3ca73959b12dc660d63a72b440d80ac4ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x10166 10648 bytes
font_02_sfnt_off000119c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x119C1 16792 bytes