Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d507bd8fc1018e4…

MALICIOUS

PDF

98.9 KB Created: 2021-08-11 22:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: f058845b81e507c07c03e1d1fdf034eb SHA-1: 4b7c5104adf1f06f075ff19829af3fd050dd08bc SHA-256: 4d507bd8fc1018e46696f18440b3c9955208cbbf41b8dd4ce47f9eb03a5c0843
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links, many of which point to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect the user to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/v6skteicg81v3qv67bdeb0j2b2/sojurubogugabumolapugom.pdf In PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f4197e253---90932419851.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/76571801665.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/53m21lrdvpgl2urstri59b2f4f/20550263240.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/d777f91ef5ccb34186037b8a7fe38f92/gewozamibopafave.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607f884ac6f7e---23249468611.pdfIn PDF document text
    • https://nhadatonline24h.com/Images_upload/files/rakojasufelejiputatet.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/57413287076.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/56657751665.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210709112626_760435128.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a7b2c80fc---52919081777.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/jasimi.pdfIn PDF document text
    • https://ever-progress.com/upload/files/77844881375.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/18440789540.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/nerosenej.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16100ef8ea67ec---tepiruxesiweruda.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/91f3da72faed90854eff1b52e4d6ba71/babivodazusanupape.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c14e3ee0a---58799743761.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/d0d648ff81717ebf14f64f743aa9a333/folezemegitewotidewom.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca939d327e---10618608958.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/ce04b55aa36e888402894ea698ceee5a/nelakej.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/rekotezon.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/xifarovagu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=residential+construction+cost+estimate+spreadsheetPDF 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_off00011d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13548 10924 bytes
SHA-256: 33e029e80fe23aabd6cd384636770583ffbb158eb7342d54ceb4f78fe5b28df0
font_02_sfnt_off00014e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E5F 17312 bytes
SHA-256: 0ba254420ba70e38514694d52d6043e85f23b683cd69e681b9c9807619ed617a

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