Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5766d0aa9c3860e…

MALICIOUS

PDF

106.1 KB Created: 2021-09-03 02:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 071564a02af200334c79a42d99122a5e SHA-1: 366cc58cc45924c042e048bb466184ef71e1722a SHA-256: f5766d0aa9c3860efe7933ebb6edcaf613c0db0dd4a08238c8821acd3e0cd5b9
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm on compromised or disposable hosting. The embedded URLs point to various domains, many of which are likely part of a campaign to redirect users to malicious content. The PDF structure and numerous external links suggest an attempt to exploit user trust or curiosity to lead them to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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=st+coleridge+as+a+critic+pdf PDF link annotation
    • http://digitalpolicycouncil.com/imagenes/file/29395250979.pdfIn PDF document text
    • http://elitvorota.ru/f/file/leperusolivomonafetuxe.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/lojuwutimasomu.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609030fda23a5---68129355073.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/28373583501.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/81430638253.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/58610118208.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/55278308330.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/36142919571.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/0fdc8c1272ebbb68e5991c93eb9780c1/56539499192.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/g58mbskiqa9gnsg9sf444bb9is/54370793427.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/69d3f8467bde86596e6c7762cd73f9b3/zuwosewag.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/fupugutox.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1611c224e00cb4---tidopanebizoju.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/hiv8s07llqtnal63o9uh92od74/40758082727.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/93527175069.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8be8a4c33---18560795726.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/79eb0a522055a3dd097ab8a99555a130/mesurugedeserunu.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/21978366179.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/bfd8488c302be1873edc6cca8d15e452/42699257513.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/92fa52119b473ba7442751240039f914/muwapoxidakaforulojur.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fae990c4af---beredaxokin.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160865f5970cf5---pawurasovunosuwokames.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161234f0d0c8a6---78128965268.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/52938312818.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_off00013a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001521e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1521E 18648 bytes
SHA-256: f97f28f7ceadaa615aa989cd2064876feb2d00c7f33d707ea7b6e5ec4cc61fd2
font_02_sfnt_off000181cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181CC 10768 bytes
SHA-256: 481b9f82926958679c73d9ff477275580d92bf509374801b87111467d4a45402

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