Malicious PDF — malware analysis report

Static analysis result for SHA-256 371645d4efe7469e…

MALICIOUS

PDF

72.4 KB Created: 2021-09-05 18:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0ded590b564eb761462c2e03d033b5b4 SHA-1: 8f6c4884a06bf52f1cbbe90b6a06a7d62b88488e SHA-256: 371645d4efe7469ed26cdff6ab94a5cfd70f8161305b3c01fc6bde71d4af837e
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to compromised WordPress sites and other domains, suggesting it's part of a link farm designed to redirect users to malicious content. The file's structure and embedded URLs indicate an attempt to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pistant.ru/uplcv?utm_term=worksheet+works+prime+number+maze+answers PDF link annotation
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c94bba7c93c---xedavilogazitobi.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608e004752515---wodovesifeguzegoxi.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/a34e67a5db08233806174a9ca3b61b0a/fetasekigid.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/65444004398.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/duguxiguradikokul.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/83310724391.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/99245262147.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160b1372da6976---53195486899.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/mugoxo.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/podipogedomexazupog.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/wuvenalevazojogig.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/87c94ac492584587f534ab585cfac30a/sidizalozajefubodekonon.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607daf4f4d8d6---kivolegagebanepipuviw.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/59678804468.pdfIn PDF document text
    • http://fullx.net/files/dabavisawutejuxivegiti.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/mobodolifutavev.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/gumuwi.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/044493a9c49458c4e723fea445291b8b/sojugofa.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/batositabotavoripekug.pdfIn PDF document text
    • http://gorillatheory.com/admin/upload/file/20117030295.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/muperupugo.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/13144456730.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/jasogarogunax.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_off0000ba32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA32 15684 bytes
SHA-256: 1969de407f4dde2187ced1a95f7bd50bf3776be0d52c82b68e0c8bad53d7bfbd
font_01_sfnt_off0000e294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE294 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000faab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAB 10940 bytes
SHA-256: 073fc5e3746a5a120d0346ca315c7a75b4ddea4c827861dd5b2bf35ea38cc929

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