Malicious PDF — malware analysis report

Static analysis result for SHA-256 a284bca62394151a…

MALICIOUS

PDF

72.2 KB Created: 2021-09-06 21:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 57216d66929e8da797dee313ec1e54db SHA-1: d9b27785bf6cf8459fb7cc2e17ef9cba6c8c4213 SHA-256: a284bca62394151a6d5ef4f8b23522b36cab065deb0216614e17867731f60b59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and link farm behavior are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://hagelkonzept.de/userfiles/file/22310477579.pdf In PDF document text
    • http://royalgoodviewresort.com/Uploads/file/bexudosanur.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/33607043162.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021623127316175.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/75493413900.pdfIn PDF document text
    • http://sns.hu/_user/file/murijovabikulil.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/59716292822.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/4a3935387751ae1371be532d30e13bf2/xonikulepenovagudizote.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/sn1fq26b2raafsb46q3nponrk5/kixuzoz.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/77862029575.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/77378656158.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d0ba129a597---depasozomabebufolozuvigiz.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/nurafijipokojat.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/bezubatumi.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a03b0b423ed---japejevutezunede.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/xutubegagulujubowaba.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/49306873261.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbea47eae1---52443098170.pdfIn PDF document text
    • http://peusch.lu/userfiles/files/sirigagujol.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/84387099520.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/113db6f7c4ce67595bfc52f4a5c41aca/xigodavorimojusufudeveb.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/gorirolu.pdfIn PDF document text
    • http://watch62.ru/files/files/xelunudijumerigoger.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5417a7d541---zemojuwumurimasebilebew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=wien+bridge+oscillator+frequency+derivation+pdfPDF 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_off0000b6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECC 11356 bytes
SHA-256: 01a331428aed0eb3ae301b7c6bc34309ac217be7591842123d7e12df7523c8ce
font_02_sfnt_off0000e8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FA 16328 bytes
SHA-256: 30e0517de859d686045c135b73cf0de347d4ed270c69af8ff0bcaeb33e430e35

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