Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0b340f82e072de3…

MALICIOUS

PDF

76.1 KB Created: 2021-09-05 01:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d86a07a0be3fad00f8deb54a7aa89e8e SHA-1: 1b94c39ecf6e213e4cc37ac861243a2c410562c6 SHA-256: f0b340f82e072de375da639312c0884a1490191a7888974dd34d0dcca647b9b2
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable domains. These links are likely used to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://allytemp.ru/uplcv?utm_term=music+theory+for+guitarists+tom+kolb+pdf PDF link annotation
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16105bda37c2a1---debanef.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/ba952e441d92df7ed275645b5be9c2e6/67108595856.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/nawetesogi.pdfIn PDF document text
    • http://0851gay.org/userfiles/202106file/2021062601151570554.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/66699505518.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/wenujab.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/zirigiraperowa.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/c23588mll6qr47vb48chgboe63/12094889075.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/29867240744.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/jawakojinaj.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161045ce0e170a---87620844457.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/e3c650d8fa878bdfebfd4ffe03c2f9ad/61892993053.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160864307ed610---84901258224.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/loxixu.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/kopuz.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/97ae31adf984d66180b60ff34e149c9b/bujudatoramodoxiworaso.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/bd45e0c2ab4d16ba2d4e43ee92764bf7/60695759752.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/letudikabobibisibugep.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6922d7d2d---guzafevegasebubirivo.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/c0jgdo8ph2h4nfa6pip8256gj7/mexotete.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/vibunutarewa.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c969592914c---gejubexojabagixasivonusam.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f8b3ce14d3d---18963655381.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210728024352.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/44f871f4e95d93e77eed948e690b4dfd/87935473770.pdfIn PDF document text
    • https://ever-progress.com/upload/files/nirutawuliwuvetojanara.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_off0000c412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC412 16348 bytes
SHA-256: f9a30f18d0016c9dad4793d4d7204b1acda1f4f6a2ad409fab3fb6587dbe2f4b
font_01_sfnt_off0000ee1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1F 11404 bytes
SHA-256: fd8abc8ef3100244bfa8a8d5312f6302fa054e71d5cd9a876a9fd8315488c023
font_02_sfnt_off000108ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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