Malicious PDF — malware analysis report

Static analysis result for SHA-256 73209c22fc919e68…

MALICIOUS

PDF

109.9 KB Created: 2021-07-28 04:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 873f5b47c68db9cb796fa667dd6327d6 SHA-1: 63099a03640b61ee4501dd3796be7fe8fb5f7c87 SHA-256: 73209c22fc919e68b0b01e7f2f95ccb47eb9640694536ecba83f2742c14bdb87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The presence of external URIs and link farms suggests an attempt to lead users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://tcihk.com/userfiles/89843146865.pdf In PDF document text
    • https://elitstroycraft.ru/source/file/48306201284.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7bb7db1c8---39908612421.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/8038227359.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/99975006587.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/ludajidesaf.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/pidabekorenedo.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a97dea9d250---12531273200.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608de980da36e---fowiberafasubag.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/27584083157.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/kedunofomas.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/99341709907.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/a06f9284f563abba7bcb3b716e7f6671/vajanizive.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/lunefuzolujelugojiseper.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846c6d6308a---kivazukofakizenipawidowoz.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/kilovopidul.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/98519071656.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882bb956a0e---62816740009.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/3908cdf3e75ad5745be5951c6f357847/16992016453.pdfIn PDF document text
    • http://elite-weekend.com/clients/9/94/945a7f92a07ecc721aac768ad340748a/File/88867959768.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798cb4e9b4e---nuxim.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607397d06771b---viravo.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed67ba543b---45902006062.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/14812573988.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=learn+malayalam+in+30+days+through+tamil+pdf+free+downloadPDF 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_off000145d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DE8 18388 bytes
SHA-256: be29e8da640dc038c393d49be27dac9e2ea3a15bb9cc7b44e25b45bf93775596
font_02_sfnt_off00018ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EA8 11496 bytes
SHA-256: e1a7c0eaebbfb720144c7a391b8d5e5279dfd0482c15bb3c60bc06a0af56b1ca