Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d6ba9a3fd46809…

MALICIOUS

PDF

77.2 KB Created: 2021-09-02 17:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7a09d02f22a82db9ab99efe98ca16f80 SHA-1: 14ed7560a35d16d5569e1f9670040bb683d868bd SHA-256: 37d6ba9a3fd46809840dc59b7ee4adb2ef2b95966ced4be8ed4aab34108e159e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. The embedded JavaScript likely facilitates the redirection or download of malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=switchgear+and+protection+diploma+book+pdf PDF link annotation
    • https://ahreco.com/uploads/news_file/debikujafuxusigumebadexuf.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/kefavoxibudiwuviriki.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5ec120065---ditaxoxagavipofewijomeni.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/r9s7qheg10a2rb0hnjcpmp6ch7/doxefutiz.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070a046c7dd3---godujobunuxiradufuzis.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/bolutejitupebufopo.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/67552564026.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611a3baa22d89---79363900073.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/2359415264.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/27602724325.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/93770177459.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/newumenovowuwufisez.pdfIn PDF document text
    • https://angkaganjil.com/contents//files/topaxujufisajexagujamir.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/19978477949.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/titovasanobemadeverimixos.pdfIn PDF document text
    • https://ka-base.no/images_content/file/pafapovejedozizedufow.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160916e4065593---xisatad.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16082f34f9aa0d---20404909773.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/19d12b1e99f36c3591d7710de5317449/982508316.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1287644fd---23205470762.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/31685110256.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/68369361287.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents//files/31574596995.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/9fdc4dc82815caefce52379e3c51505b/turisupalexozivuti.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/26897363646.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8edd35325---55816361678.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_off0000c8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AB 16920 bytes
SHA-256: 4e495c446c8c0e7945abbe3e84128c9ca7a3800d39b30f14af0bd253a2e2d09b
font_01_sfnt_off0000f48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA6 11292 bytes
SHA-256: c5d8e7a8b841be63ce73bb51ad48de58e76073dcfcbf981c143da37634555375

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