Malicious PDF — malware analysis report

Static analysis result for SHA-256 f68b58d2783c5393…

MALICIOUS

PDF

96.1 KB Created: 2021-07-01 10:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6ed4ee8435a1e8c265bd5d1cb842b653 SHA-1: eff4519131b6f44f56b40b151086fd79930f394f SHA-256: f68b58d2783c53934f00260e2f548baab857599671f66aae2c84c2792c4a89ff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to obscure the ultimate malicious destination. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a phishing attempt that likely leads to a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://archism.ru/uplcv?utm_term=all+banking+related+terms+pdf PDF link annotation
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/95215572193.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608119ebca3ce---kezoxakagesokukadif.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a502e66752b---55956419807.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/2203852703.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57d85a7091---53370371456.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/4f53842273454eb1ce5e618a9a23606f/vuletopas.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b7daa3db2d0---4798270690.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e9f30f8f4---2586575511.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/e98a3de165873598d01a468c075ad37d/24410341118.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/2ea582e56ce5495f4a9175d766d9290b/rafiranagapukogenuna.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/9123375709.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085363906510---49960165825.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/4f99a269a4411583223b5cda0f33ee65/zuwojevuvupolikilimo.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/26532658497.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/45045397432.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/zirotuwisobikuliparedi.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/0d4bebb0e5306193b7b3b73dff104f5b/60899604378.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/abb37b67c75d326924220de72a43453c/genexafej.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/5e973b36d1d6ee9c72ed74e4b018d17d/rilidonijomalar.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/8432df15c23b0aba0b672c4293db7e54/mimagiz.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31550ebc29---23955649705.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/loriluriruvijov.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b433c9cbc0---bujesama.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_off00011438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11438 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4F 10936 bytes
SHA-256: 25445463352c342594f6c36d924f7dc987d59a947654de35469b69e2454837e7
font_02_sfnt_off00014540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14540 16944 bytes
SHA-256: 4fa36561d0fb610cf2c70e22ee1e4db34a15e4ca797deb997926d01e26d5ff12