Malicious PDF — malware analysis report

Static analysis result for SHA-256 294dbff31b9bae8c…

MALICIOUS

PDF

97.1 KB Created: 2021-09-01 01:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c171d99ea9f68cb3aa8582a870487000 SHA-1: 9a6f9bbc5dbe32eca4091cb640234e6c57b10485 SHA-256: 294dbff31b9bae8c994e7c59fb86c7a7ac8e77e66963880c33ec3999733a53ea
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded links likely serve to redirect the user to a site that will prompt a download or exploit a vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://garglob.ru/uplcv?utm_term=principles+of+financial+accounting+pdf+free+download PDF link annotation
    • http://files.ibiza-ferien.de/file/8394548379.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/48c63e8083fbab4a53d6e0c567450d32/gojufirovajekar.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/03b3b93a8a0b10dc061956604e463a74/15849189262.pdfIn PDF document text
    • https://12shio3.com/contents//files/61232089917.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/750cc8e9bfa1705311dd207b2da3d598/getifojuwunenisipe.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/720700504.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/2i1ffi49063l55itbrmqdmn101/vogup.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/vikilofipog.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/57570131102.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/sawofavixisonemusagufovi.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/4802726818.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/40722420611.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/tufoxanelutifamilujomuxe.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/c05aa70132966b718be69d708adce19f/76653542203.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/fonomusisagajeremixoguvib.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/dovewufasusekapoxinoru.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/59922879647.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c9a50d0a3---67278816874.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/497ba3a4acb644a4c69b29a6a6984679/satosebimabemezed.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/zisezubanojede.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d31eb48d7ef2d95d90911ca834a208da/fewubuduwivuvipav.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/28530732762.pdfIn PDF document text
    • http://cwesp.biz/upload/file/lefap.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_off00011208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11208 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1F 10980 bytes
SHA-256: cdd0d4115db824441774b3c9a01a5ae8e189b8898a98cb88de87368e0fb3bb0e
font_02_sfnt_off00014392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14392 19092 bytes
SHA-256: c72db9cf2b09696d4d2f64503c017057a3b62e739f597711e09a6a09e9b063bc

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