Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d4f9fe1750df4f…

MALICIOUS

PDF

85.5 KB Created: 2021-07-02 20:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1e91d4814725fd9b1701f77aa4f332c5 SHA-1: 51be5b30e74de69ab17978373261888bf52d789a SHA-256: b9d4f9fe1750df4faf272579814c7d6078b8bcff882f98e4b94d2dd74766ab79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous external links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of numerous URLs suggests the primary attack pattern involves redirecting the user to malicious content hosted externally.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://archism.ru/uplcv?utm_term=record+for+2+mile+run PDF link annotation
    • http://cloverpark1959.com/clients/51168/File/67233236980.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/genusativinomizevuro.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/wojisadexikisegiwozew.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/235jrvvg7hiaf7b3kim0dl1r8i/jifovozeveluz.pdfIn PDF document text
    • http://jfk1969nola.com/clients/873000/File/28476907526.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708481e65bf---gerakezebixitotex.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-9/20210509124635875975.pdfIn PDF document text
    • http://chhsclassof70.com/clients/1/1f/1f6d1b94cf555b90b9f410dfa82aea5f/File/nifetukunod.pdfIn PDF document text
    • http://shepardfarm.com/clients/877021/File/jalefamuworazogimuf.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609eeb834f6c8---17490010038.pdfIn PDF document text
    • https://2acontractor.it/images/file/30751551021.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b86adf06175---23519382378.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d0f8ceaf1---muzoxopoxuzolukujedexot.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/09e87a48bea34ba22b6205ecef89c2da/25668376605.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/cq7tjn658b5djch1h8a9v1949c/forijawerimowovepigi.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/511a51bfbbd9a3ae96d1c9265a511127/wixukem.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/863okskucc9iu58u6ukjm422oo/88222951098.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/wejidubuwi.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160ae81e91d141---jumibaxomet.pdfIn PDF document text
    • http://amandamaitland.com/images/file/1833137351.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089f0c7d4546---fafabeperanotozinutupag.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2363e59ca---vogewepegonedabetujixoka.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/jejefefipuzi.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_off0000ebb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB1 10472 bytes
SHA-256: 136f4f229580584c73bfa6d00d5810539afba05d41deb790699fefdafcac3211
font_01_sfnt_off0001036d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036D 17416 bytes
SHA-256: da889f8899e7037e7b8673eb11dcef459b5c47a86f9541072d513e3ec31c5781
font_02_sfnt_off000130f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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