Malicious PDF — malware analysis report

Static analysis result for SHA-256 6752fcf275a8d24e…

MALICIOUS

PDF

80.5 KB Created: 2021-09-03 10:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ab68978b24a29571ba36a95960f69b9e SHA-1: 87be487c117b66323c06096db9e4a58548670ad8 SHA-256: 6752fcf275a8d24edfcd39b164a7b2ddbe909ff7e254f7a7ab36fe81dab3915c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple external URLs, many hosted on disposable domains or compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing pages or download further malware. The embedded JavaScript is a primary mechanism for this redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4333e4a5c---342367406.pdf In PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608511aae3329---10604870708.pdfIn PDF document text
    • http://scro.ru/pic/file/movefuwafo.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/70686236687.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/63490523538.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c137487c322---50569458346.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/jiwodotufelivegeno.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/26020455982.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/78096892185.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/e31627463bc8adbf7da0a08870a29c74/3827875630.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/52162184240.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/96493179710.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef275ede72---72255721846.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/vjmrplvphngklhfbud4irrdcjd/fiketum.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/38937265368.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a19295c5b---85947442579.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/63587552584.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c085a97327a---34467608593.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792eef2420a---wububafuvinoro.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/34536151034.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__60FF614FD4D65.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/002426bd6d7b7ebc5928776f3a56dafb/busixidopuwozoxaka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=como+convertir+pdf+a+png+150+pppPDF 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_off0000cd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD06 20448 bytes
SHA-256: dab67f6e8633f1009dd991539374457c9a851ebf1199bf5cd387cfec5afee1cb
font_01_sfnt_off00010268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10268 11156 bytes
SHA-256: a9884b8a5739eade31eed9f0a224c1deaaea354bc459f685d8be7d52344ba74d
font_02_sfnt_off00011c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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