Malicious PDF — malware analysis report

Static analysis result for SHA-256 132154255ec605fb…

MALICIOUS

PDF

71.6 KB Created: 2021-10-02 12:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d6e447344dad5bfac600dcba2103ad7c SHA-1: f9335cd79642a85ad11c13d1265e301625dab292 SHA-256: 132154255ec605fb60fe571992b3b1bbac789a8639842347f938e4173759f4d1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • 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://medvor.ru/uplcv?utm_term=5th+grade+social+studies+worksheets+with+answer+key+pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614a1353d54b4---88481444596.pdf
    • http://gerocuki.hu/user/file/lovizanuzavunigakimasa.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b53df67ac9---luxiwovuvaxakosagub.pdf
    • http://czernavendeghaz.hu/admin1/file/34524062097.pdf
    • https://corcreation.twbiz.me/data/fckeditor/files/20210920_105011.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f07af278b1---gadegumot.pdf
    • http://maysoi.com/hinhanh_fckeditor/file/4909942799.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3ca5eb456---95321445895.pdf
    • http://retailcop.ca/files/miwumevalexinidakozokafe.pdf
    • https://ceiling.holcom.vn/webroot/img/files/15501491149.pdf
    • http://decaiyun.com/upload/file/210927082503195339v48g1x4s2345.pdf
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/86011399113.pdf
    • http://chaukitchen.com/uploads/files/pinura.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161568fff1dd47---jobunop.pdf
    • http://wolfpackbasketballacademy.com/content_docs/55640345576.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161499d1ebe2c3---8548201546.pdf
    • http://fcraregistration.com/UploadedData/file/zitodobad.pdf
    • https://comtraining.cl/userfiles/files/39068764298.pdf
    • http://parfumerieindex.nl/images/uploads/wolopatez.pdf
    • http://hzxf.com/images/upload/File/39716164890.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161497efb0b88a---retaxatedar.pdf
    • http://inggeo.eu/userfiles/files/75706884595.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2d3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D3 16792 bytes
font_01_sfnt_off0000caea.bin
e176fb1f015541e164292694f5fd6e4f61d35fb3af8dbc844c831a18fa219b32		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEA 11328 bytes
font_02_sfnt_off0000e561.bin
7f6665a76b6aad99107cb68cbe69a79091cb96df13a14470fe642ac724a0eb24		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE561 16920 bytes

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