Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cadf3248ca4db2d…

MALICIOUS

PDF

84.5 KB Created: 2021-08-28 12:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: a2c6c4c0d5354eb09cd432278985067d SHA-1: 6483154fe09e7c31d653bc1a4740f7a685d9f817 SHA-256: 6cadf3248ca4db2d71fb343160873e6dea4be6453b9bf6b3056c6a25d9a27e4a
164 Risk Score

Malware Insights

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

This PDF was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document contains a link farm pointing to multiple domains, some of which appear to be compromised or disposable hosting, suggesting an attempt to distribute malware or phish for credentials. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a malicious workflow designed to obscure the true destination of the user's click.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://health-bridge.in/upload/file/51599816693.pdf In PDF document text
    • http://guides2alpes.fr/uploads/file/78138410263.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/tupijisozukisane.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1aed6a8935e96b2069df153de19a62e6/28971235953.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/pagizofixosod.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a981b61197f---vutikusurugurulapolebonut.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/kegopoduruwobodipebojanig.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b631c4125a---11256220238.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6280da5c9---nulovokipabigiko.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/evd9q9rmsnpev0e10a1baa6nvv/pupibumawenowowotutojur.pdfIn PDF document text
    • http://fishingas.com/userfiles/file/zivokedosunumub.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/5fbd39d734cd83fe3f745a60dd7bb33f/99491344945.pdfIn PDF document text
    • https://bulgariapools.com/contents//files/92595670322.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/kumapinolavuvututowogek.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/m4q8fn40m92mhsgbhp1tu08ti8/86082574528.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757d968e307---muxokotutumamatoxirerare.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160744169c4605---lubojadifozuraj.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/118ecb525692649e7fb8fb05eb66d979/93694367722.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/ce38fde9ea62256f9afb27f0014b686b/12102866190.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071be99ed6d4---846057583.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160cd6be8a7795---41402084647.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/89165561583.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/bivukililupusuxuzude.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/73213750711.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=multiple+pdfs+to+single+pdf+converter+onlinePDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/jotijemokepogirinejezelez.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_off0000e58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58B 17040 bytes
SHA-256: b8f975bdc7ff8750149103e9226747a26c09ebee135724422f68c137a54084ce
font_01_sfnt_off000111b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B1 10792 bytes
SHA-256: 1d6c173fe1b70fe990c408af4228f63ecc551aec70b9677932ca5122e887d9b9
font_02_sfnt_off00012a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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