Malicious PDF — malware analysis report

Static analysis result for SHA-256 c242faf45d2e9eb4…

MALICIOUS

PDF

88.6 KB Created: 2021-07-06 12:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 77f315bd3dbab639c83abc230b6540a8 SHA-1: 7882a9a113e0e82cb5f43415c0ff4fe23c94449a SHA-256: c242faf45d2e9eb4c0ce44ac6114f26969659be1c0761a514a328aa2b7009c0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The document body is heavily obfuscated and unreadable, providing no further context on its specific purpose beyond the link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16087eb3e1665f---fomakixavujunefipovaxovex.pdf In PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/pubekc61ji3k3g7uva8lmvfbt3/mafiviwujowa.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607363e17c353---jupomekebemojux.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f78780bc20---29630766268.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/55261303672.pdfIn PDF document text
    • https://smithsgame.com/calisma2/files/uploads/73751800778.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-7/20210507051511741464.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5f3aeaee3---xifigog.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769e0cd7876---ratikojelezawabajapoleso.pdfIn PDF document text
    • http://cjandjunemillerfarm.com/clients/75830/File/gonixefo.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160865a1b9339d---78236482994.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4213fc284a---46344109940.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/80441574117.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c65e5cb78d---gifikosuranulolopin.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/1982ba7e2c0baa1c0ecf16d9e2c72977/fokoruvewadoraxokatap.pdfIn PDF document text
    • https://abeess.com/userfiles/file/jewumorakozexan.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16099aee82f0b9---51942177511.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b64decba9bc---18872334346.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/20e9843e75fe5220f840db0596bb40a1/nirumemovagej.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/36368696204.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/4665c5eaa287b68d373b64a8685fce8e/bafuzoxadujedomokuti.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcc02431bba---fumotovonewom.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/99938188033.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802c23ea08c---gisaxupawunumaxewumifile.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a84e495c423---mofuboxasagi.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/5024702431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=jesus+in+calligraphyPDF link annotation
    • 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_off0000f79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79E 10640 bytes
SHA-256: 7cb17b8d1f635f309cd6bec85809c10a2bdcd6484f96478511ce6214fd59408c
font_01_sfnt_off00010fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDE 17296 bytes
SHA-256: 6228a3d7e24c2696eb37aeb2311fc20705dffafc75981f8ffe7515675974af99
font_02_sfnt_off00013d2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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