Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c547e3f147b015…

MALICIOUS

PDF

84.2 KB Created: 2021-09-03 21:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7bd6dc36e05ae1d03348a9d64d34d9da SHA-1: 1eb01f3e22b8f6fd00599e805e7d7e5f2d7630c3 SHA-256: 80c547e3f147b015afff49a8e0d776a7a397f3d4f01eb9504ea84f403a8772d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers identified this file as malicious, likely a phishing or trojan delivery mechanism. The presence of external URI links and compromised CMS upload links strongly suggests an attempt to lure users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=criterion+referenced+test+advantages+disadvantages+pdf PDF link annotation
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d147385526---tinatokigekulawof.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/65d7bfc0b4dede965de512aeee0d4cb9/14168571665.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/3730106d4ef216ad8a08507a95af3db9/xewinezudumigobiz.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/tigutamimajugol.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/70613522869.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/084b4a4f422e9e53e96a46152712dc26/nuvisovezudir.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2d47383c6---1556691986.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16123b2bdc637f---86683102083.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608605ac42dd9---fituzapomepeneje.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607713103f872---33745503338.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/wojodezekabaguxorugupawo.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/19668664191.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/baxomitoxuva.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/f8m9a6dr5qdpgebfja73n8s0nh/dixagoronebojemi.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/68b997ad9dd6555b59b182550e28ddfb/43601854502.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/26384915024.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118b67536edf---supaxukadusila.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/mogikoninujunota.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/kitalojutojopul.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160774c1909fb3---gudexapigamovinide.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/90190363417.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/21791404015.pdfIn PDF document text
    • http://teraval.cz/res/file/derenaw.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/f72c41119a5f81fff44c4f330f84dbd0/29783368726.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d3cbf30ee0b---dowezuzekuliridulot.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/tolekenizapaxujedi.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/23539230820.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_off0000e670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE670 10844 bytes
SHA-256: bd8db83483158c78585f435fe2cc46cd107b774459ebbfaf45ffb6b10aee4e01
font_01_sfnt_off0000ff74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF74 16568 bytes
SHA-256: b911da943770d0a214807a73c68d9679bf5943ae8dcaa7b07b9cf9e67f96505b
font_02_sfnt_off00012a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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