Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf645d8a3cf5c30…

MALICIOUS

PDF

72.5 KB Created: 2021-07-01 18:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d2b294a8bad73fd4c1c3d80c662f24cd SHA-1: 94ea932485ed15a41edcf33f9f40abc90dac3cf2 SHA-256: ccf645d8a3cf5c305dea1f696a54b8d554a5b5fe95aac2cbc1dac5bd98c76b1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it's used to distribute further malicious content or phish users. The embedded URLs, while some are marked benign, are part of a larger infrastructure designed to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608614700100b---48059207982.pdf In PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2040659ed6---lekobixepizopa.pdfIn PDF document text
    • http://ccsl.asia/files/40789045465.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/zadujiwewulo.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/41584714164.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/timt0obqufbmhj5pceo8691s5a/6039130156.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/baluda.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c46351bb5---musuziviworabesud.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077eac71ea89---39141343222.pdfIn PDF document text
    • https://sealskinz.ru/files/file/9248199866.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/6c134d92c33d0b62c06d150c70f2bffb/dasosinaguputurapi.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/23074113006.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d11b75d5c7---fopotanujodidisazivis.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/56392485111.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/kovirezizeg.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a29cb99a397d6ba2ea00761f2dc68618/makabepiwafe.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072cd9e839bb---70049830680.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b719bcf55---nonudoxejivutasizub.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/69074570346.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080cc2f36b7a---40977077861.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/2cba4ab6c4f459a3357714fa25ca94b0/82450261797.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775ac53929f---60237710603.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/58464a4f9cf3584e6cffb52b93022d72/23465733118.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607452a766927---musetekadiferotumam.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/5hv5ormt109l1hanp51jeiksqi/dotalazugejava.pdfIn PDF document text
    • http://soupworld.de/upload/file/59249746759.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=limiting+sum+of+a+geometric+seriesPDF 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_off0000bb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB36 15776 bytes
SHA-256: 7ba7a9432042aba9fe3d5605d29ca2be7ebded7e57a3014e055ce49e66d7404b
font_01_sfnt_off0000e3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD6 10692 bytes
SHA-256: 9b797eb167d81954d8a3a36a928f596c92ceb1384148c681324b3307cf490dc3

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