Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff75391d287af10b…

MALICIOUS

PDF

82.1 KB Created: 2021-09-06 11:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1c0ebc7e667572117a5e3eadcd8572c8 SHA-1: d4b529772ccf10981a956b011bac66a9fd785380 SHA-256: ff75391d287af10b5bd847634f9c82bbc9540c7e4bc2d3f326af4bd3aed7f2f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/40b614d1b00bf27dcfa8b1e484875a41/kafexixoxunolok.pdf In PDF document text
    • https://idd.no/ckfinder/userfiles/files/23312166742.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/rajupunipuri.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c922a8c03---nuvowolewifanitijuxegew.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/d3136ec0153dace1b8c4cba863b65b58/4271087392.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/wojutawo.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/d43c62f2cf610119d1d219b574bcc56a/lubenesosugubigolavalu.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1622017896.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/48264719386.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/tisizokigagoveb.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/dumilekororemeseboxisef.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/lijilove.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769d9e155a5---buzixod.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/xatobawolin.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/55014492741.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/9274563cd1367a9d72b36a7cc5bb86b9/56989868318.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16127050ba3c3a---49172490845.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/b1e28d1a129fb65a9c974a3b86eab523/degufezimogesivojom.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/a92df8a9e9599598313846580eb5f0b5/37056739955.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/65653384686.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f171d47ed---lijokumobuvigawotexawilix.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f90d7518bb8---wedafovagudep.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/pusamanemexupasaman.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/91912348136.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/ligavem.pdfIn PDF document text
    • https://shiokuda2.com/contents//files/vosazixadutofesij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=jos%C3%A9+saramago+a+jangada+de+pedra+pdfPDF 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_off0000d329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD329 20900 bytes
SHA-256: edb901a19c21dd4a503706fc5709f41a5126a3e5402282029be3f18a67d38d38
font_01_sfnt_off00010791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10791 10880 bytes
SHA-256: 72a1fb68689b273177d828cc583b1ab0c5abff983184b6c02df9a672cd7e8176
font_02_sfnt_off00012038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12038 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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