Malicious PDF — malware analysis report

Static analysis result for SHA-256 70832557a92d399e…

MALICIOUS

PDF

82.5 KB Created: 2021-07-31 04:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 42b7a6a438c79eb6cbe405493c5793cf SHA-1: a77e5957158514e1a30a63c6ceb3e003ea99766e SHA-256: 70832557a92d399efd6163457410dbb9a6b0c59237292ca94099331c463ce3a1
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to websites hosted on compromised content management systems or disposable hosting. This behavior is indicative of a link farm designed to redirect users to potentially malicious content or phishing sites. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hydrogears.com/survey/userfiles/files/20681585535.pdf In PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/5f7b3c6d1e2e1204fe1d069343aacd56/malifujiruv.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/7b3c729e07c29f22fcc83167bbff9c79/xigobufozufero.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/67408173687.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/jomoxumaxo.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a29f44bdd---32191031184.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/739c96533b41b4bb2b7e3e4907d6bd75/suruwomirus.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/57907367227.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bd1227db7---jusidasuvanovilexepar.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/panojonamux.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/qg9soqqbpd1ivvjcsirs83hsai/faletijujekitinunugifig.pdfIn PDF document text
    • http://owtsreunion.com/clients/e/e7/e717deb27d844c69ffc49b2d3c0bb1a5/File/95879798067.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/xesanegonukowuwetuzikuki.pdfIn PDF document text
    • http://stananddiane.com/clients/6/67/672a2699e369d648dd23e03de9deda78/File/zosupibimubakas.pdfIn PDF document text
    • https://tomas-music.com/contents//files/62704705801.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a0401796e65---gukudizefusuze.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/wurakifiwijomawux.pdfIn PDF document text
    • http://darec.sk/files/files/30369693221.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fekesugizi.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/0e17775f9edea957bc217fcdddc2ad8e/63962665018.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4b1b57759---11639799663.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d09053749b1---71538971419.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/sapalasi.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/77415296527.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/kokinugudupekonugamat.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/dumowokizuriw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=surah+baqarah+full+pdf+download+freePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000defc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFC 17216 bytes
SHA-256: 930c575086311624e133e50942dee62cc71b3be9a77d86af17f6c12b49ff1e06
font_02_sfnt_off0000f838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF838 16060 bytes
SHA-256: 3c94442d54d6feb246099afb970e39ffe1b29f8a87beaef7099783e011f016fc
font_03_sfnt_off000121a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A2 10784 bytes
SHA-256: 66a714e85ba3cb47db2952d848377296bef86d270ca74a0997e65de8dde36bf8