Malicious PDF — malware analysis report

Static analysis result for SHA-256 cebe9834e6ef6876…

MALICIOUS

PDF

90.0 KB Created: 2021-08-02 06:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 48db73c609c303658424479103655bd0 SHA-1: 2d41ea1946d74d68f758d05432d62d4aca3d4e4b SHA-256: cebe9834e6ef687617472e569b15261847a9c7c76722283f6a0e78b3e8609e77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a link farm with numerous external URIs pointing to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the structure and numerous outbound links suggest the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://catamma.ru/uplcv?utm_term=can+you+have+preeclampsia+with+normal+blood+pressure+readings PDF link annotation
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/gusix.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/jg2e5ossohrl09m58edb5a47mr/68191273698.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160789cd9bb2d7---8623736532.pdfIn PDF document text
    • http://hephatha100.com/clients/4/45/452f9a9cd3514f90eb92b3b4734a1f1d/File/tosozivewuronake.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/62720441782.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d410d4e3da1---90683120846.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/3311b7c87ea2810198b8b4b031eb47a9/lodesejewidukukewal.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/22703641476.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/bejetupa.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da7408d4823---14520251644.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/6bea7fe26c5eb88e189c7ce09560190e/47505836695.pdfIn PDF document text
    • https://mfdesign.hu/files/file/jesifiwixoxokupere.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/91b3d358fc4ad149c2844dc56dc766ac/bozuvo.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/e38df27fe3e04c3e5a6c2882afd6b31d/81051789569.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/7ec95338bd9f90f31658d80651a83179/74802159426.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/936c5e660604ac78f1e91e724b48eed4/fijonuvedetasipililazalet.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/felozilovoperivole.pdfIn PDF document text
    • http://schokozentrale.de/idata/wukixamumapet.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/33834221446.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609a491885218---fizokujagiwabepofebi.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/89424887061.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/jupetelesobuwonape.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160afc71924747---womamurexaxetozamumiwikiz.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/gi3scrcptn35bpk1d105o0njed/39429150760.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/wumaredofegik.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_off0000f93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93C 11496 bytes
SHA-256: ad26d10d3d79f56975ba23d899c9c127fa781ecc662e05c8a67c8d8d46f07406
font_01_sfnt_off000113e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E9 17120 bytes
SHA-256: 59b190945069ac1ddeab0f2212e5aba1ba3b30272751c04d7ea4bdb9a8dc1743
font_02_sfnt_off000140ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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