Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cb5d86f26e73c57…

MALICIOUS

PDF

73.7 KB Created: 2021-09-06 15:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f1da59d6052b50eccb3175d061ee329 SHA-1: d60b38bd3b789d4d0217623bc9308eacaf7ae32f SHA-256: 7cb5d86f26e73c574a690f4eefa941a77bbb133639f6dc30490968778c1ff423
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple unknown PDF files hosted on various domains, suggesting an attempt to redirect users to malicious content or exploit them. The presence of multiple external URIs and a link farm heuristic indicates a pattern of directing users away from the current document to potentially compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/db03ff905764b48ba4fc09a16d69e88e/wexetizabiro.pdf
    • http://bertrandetgastineaudesigners.com/userfiles/file/13269732524.pdf
    • http://studiocinti.eu/userfiles/files/67720589281.pdf
    • https://ppkh.net/userfiles/file/gababavajomituvidusurar.pdf
    • http://ckm-machinery.com/userfiles/files/83379403487.pdf
    • http://labotinnghia.com/img/files/zapex.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/98663071023.pdf
    • http://fsoa.cn/userfiles/file/kojoxaxigalijupurewesi.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/e1a768b3be22c86d66fb78a80b77b51f/fisaxuri.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a0bddfc6c---38647915343.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3715d3dd66---93415521193.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1612a1f456ae99---6095947639.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8f24fc75f4---sonisovepinuxawekidimow.pdf
    • http://wdnederland.nl/file/37277037514.pdf
    • http://csc-vietnam.vn/uploads/userfiles/file/bilen.pdf
    • http://abwcockeysville.com/uploads/files/75632120368.pdf
    • https://kodcomputers.ro/2664/uploads/37692240635.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/oecfistdvf3o0ddfu9ru89cqd9/79896813098.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/3a4dd68682561cc595bb13dbcddc5ef8/sopazolixagikoj.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/eb1860a3a8f4cfcc2c25deb3028809f1/wuvawenatufiwijekavogita.pdf
    • https://tedvandergulik.nl/userimages/file/61310021252.pdf
    • http://sitoad.com/bbqjoekey/files/202108051756002574.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=epub+to+pdf+converter+software+for+pc
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bec8.bin
9b160f053b20fa733b29ebddbc41239a366a0c5994e0ce3d2200a2615c31bdb4
pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC8 16084 bytes
font_01_sfnt_off0000e7b6.bin
97455c645bd48dd6d8298328720ce493734f5fcbd6e8289192bfde086a7ee7a0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B6 10852 bytes
font_02_sfnt_off000100ca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x100CA 16792 bytes