Malicious PDF — malware analysis report

Static analysis result for SHA-256 9767962aac5be748…

MALICIOUS

PDF

87.1 KB Created: 2021-10-12 02:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 9e7b0a9f9665484f4fa903e532eeb78a SHA-1: 3a8d121f1a1aff82f0fee4aa21d216b465a9b3f5 SHA-256: 9767962aac5be74825a654e6b957d82724d25d6e3f5f638251e134e369038c61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress upload directories. This suggests an attempt to distribute malicious content or conduct phishing by leveraging these compromised sites. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16133e641b3192---42466505470.pdf In PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161605fa4a8f74---rutedapisogamako.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/60528801605.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/xopogaxojonozijuge.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/bewuvo.pdfIn PDF document text
    • http://meskerjager.nl/media/files/fitalitut.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/momiza.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/lunolipuxasojakomatuvevav.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613685cd2f57d---96395232304.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/16650301006.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1615f3302ec2f9---99055687170.pdfIn PDF document text
    • https://12shio1.com/contents/files/76421883195.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/34529945470.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/72704560067.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/47312439736.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/luwebosodoreta.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/diwelazagedifefudemukub.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/5be831de1e9349068d736ab092b0c4b6/didosafolovadedakivegota.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/29571552717.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/11542738509.pdfIn PDF document text
    • http://cudicio.it/images/file/fepinalivavivixi.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa3c1a20b2---41181170881.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/77324298284.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/cmwvf4RlXg4/uplcv?utm_term=dungeons+and+dragons+online+single+playerPDF 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_off0000ecd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E3 19240 bytes
SHA-256: d10cc8288af18dfa851efeaf9a42008cd95797f18fd620e1398fbc6670168764
font_02_sfnt_off0001366e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1366E 10684 bytes
SHA-256: d6df5ca285ed88e89175246929775133f9d68f4f24fb17c05a24d224579a1c85

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