Malicious PDF — malware analysis report

Static analysis result for SHA-256 e689a01d23db3933…

MALICIOUS

PDF

70.2 KB Created: 2021-09-11 15:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 65330db1890ffe705762e6757c3e28df SHA-1: 8247086a90df00d7812058f8be707ec71fa1b8da SHA-256: e689a01d23db39330466d59a96b2d6d8aff3aea4d115e34551877f0a7dc48b33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised websites or disposable domains, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, but the presence of external links and the high confidence verdict indicate a malicious intent to redirect users to potentially harmful content.

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 https://queure.ru/uplcv?utm_term=what+food+do+chickens+eat+in+minecraft PDF link annotation
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/mapujosivu.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/89328781751.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/45072698.pdfIn PDF document text
    • http://imaginove.eu/data/Files/lifuvawuxijasesutekoto.pdfIn PDF document text
    • https://badrivishal.com/media/nevadas.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c32a10bb65---91328697568.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/nubetaxizege.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/54859985984.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395989b5cb3---44060913110.pdfIn PDF document text
    • http://fnathservices.com/upload/file/66192328224.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/12944174861.pdfIn PDF document text
    • https://laser123.com/geektic/files/22906394161.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/fazin.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/sazasabuwefukusupazere.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/vosimuti.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/kazapefiwoj.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/68493444629.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/80423969361.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/a188fb62bc3225c0f8dc59f1a5437779/bulirematuresilukukep.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/sexuxore.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/35122790664.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/fovurexikovikijodap.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/18519164481.pdfIn PDF document text
    • http://gdgom.com/upload/file/210904003625008678ifmwh8yb9jh5.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139cbcc1e21a---xirutozebijabosa.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_off0000b388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB388 15212 bytes
SHA-256: 161f9e68a546011d9a49115b085847fd075c5691aca9697ca9d6a1023716b8d1
font_01_sfnt_off0000da41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF258 10780 bytes
SHA-256: af5d52d02f4b03af1170e10ef3c3043331c562f2490a1234e31e86ded40ccc05

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