Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a44640584c600f…

MALICIOUS

PDF

82.0 KB Created: 2021-09-04 21:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 246ed52445a48e434f0646455ceeea5e SHA-1: a9bced6a2cfe99ffd40ab5fcba661c926f026a11 SHA-256: c6a44640584c600f7bc97e5a5908fee0705fe73ed790266e7df7676c3ee893ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The presence of these links, combined with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic, indicates the document is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://oprandi.it/userfiles/files/teluwam.pdf In PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/82abcea6d4f8164c6586cf7293e0b7d6/jesalam.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/15fe7a1bbd67bb7ac303d8d6ffe13d82/42430340502.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/2e10b7fce513f6631bb49cb9b4e79ddd/fivazukexe.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/nikirisitunefanil.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16109bcb2a8e3f---29008004562.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1608d51d7f25b8---6257045637.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/70792102340.pdfIn PDF document text
    • https://info-jimukyoku.jp/lot/upload/files/wabowokekexaviwufo.pdfIn PDF document text
    • http://lemfhafamilylove.com/clients/a/ae/ae548a02e38cf20d1222216853584fb4/File/danukesezokivaxuvima.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be812ad32b5---2650440408.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/77485180584.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/2ac4651ce4cc82e82e74ea43f680119a/25639150175.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/a63b4828ad7afd414ad49cfc3ba3476e/tigodokiposaleluzowemilog.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/83988910366.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/11112710067.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/gumiwidisarim.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/bugabupuvoduluses.pdfIn PDF document text
    • http://psmpetcare.com/clients/76030/File/39102654657.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759be09ef79---77765150388.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/xaxiragajemamozutawo.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/tikulunojafegogusikakab.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd58eb5668---pepoviketini.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/85636524458.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/61892602878.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=volleyball+skills+and+drills+for+beginners+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_off0000dce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE9 10892 bytes
SHA-256: 3e196e894bb82b2b907ee0ba15bcc1ff70035ca01630b5edd688297c73282173
font_01_sfnt_off0000f5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE1 16972 bytes
SHA-256: a2e0befe3101db905bc89bc5e19961dfe65cbef652938ecd6353f65992781f8e

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