Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dbe8f9cda33cfd7…

MALICIOUS

PDF

90.9 KB Created: 2021-08-01 11:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6f2f8e8eb33680aef8b06ea2b333222f SHA-1: 66ed6662638536d9d0c0dce1f0465b3e284fc776 SHA-256: 3dbe8f9cda33cfd7be27642edd5a27ea649f0b9e87da35ef91f9fb7731cc77bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution scheme. Although no scripts were directly extracted, the presence of embedded URLs and the heuristic findings point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786e56199a0---68296073199.pdf In PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/93216987578.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/909798562b8860ecce7c559209ffbe86/98674465799.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e08ee15c01f---6768375310.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/f5ce6152f6099d57a75ab3595602d7e0/buzoj.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/fefawivus.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/30650308670.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/53102477821.pdfIn PDF document text
    • http://skyline1968.com/clients/74864/File/16101553197.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/wagovopexutavegigezejo.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160982ef304f95---1762905351.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/hhoj1srmjqg5fs7odbtri4tjkv/97327894791.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8411c724a8---38215117645.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/77028187748.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/152029f2814fd390feb0776ca47a5271/dabobewagakowutofet.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/texufogididoketo.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/64ki0v1ldinccoqag4am0lp090/libaseniduwa.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609df5cb90c5c---97744833926.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/f74c1080c97f5904b0188ec78aa28753/42937720384.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/naferupudopewuvafonivoliv.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d61bb42761---zudurolebid.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/17539807520.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/revabasilujev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=midas+m32+manual+germanPDF 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_off0000fe61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE61 16984 bytes
SHA-256: 10e152cff46a46a336a7eaf5f3a26fd30c2a6dce69ddad0c30cc0ffaf265ad45
font_01_sfnt_off00012ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE3 10760 bytes
SHA-256: de5e7ab8a08b5e329e6c47260660e500cc42060da8c7b3074a224bd6f97f5d2d
font_02_sfnt_off00014364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14364 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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