Malicious PDF — malware analysis report

Static analysis result for SHA-256 53357796e0d7e577…

MALICIOUS

PDF

100.9 KB Created: 2021-08-03 12:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8e659f0d11255281c0efcd6b05ba4aaa SHA-1: 030f1f7da09ae16bcd2477fb7d45cf4455cd7426 SHA-256: 53357796e0d7e57772af1fa5537bb1829242676812178954e87bc82d38c38446
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://gyndoktors.de/ckfinder/userfiles/files/11440042568.pdf In PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7f7eec242d9fd492b563cc0b37414049/fafupeg.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/jirebifaxumisakejisikujox.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/45988148622.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/b0300cf23142cdc1775ea59b5bf7ae8e/86636465745.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/9713b1ddaf3db510473a2885831f9d08/falafubulipajebojafak.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/buwepiz.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba1de6e278---27335156436.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160812e4894c52---67278274934.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/dipepoturaxokufudofeg.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a8af5d37aa8---nanudigulusirivove.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/zinedusezotakovitu.pdfIn PDF document text
    • http://wirheiraten.de/images/file/33028931128.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/dotukafurivolitotugafotov.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb7ac28c4e---xusolepuvakisopidabuw.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/bekaxozopevisumi.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887bdb33cb6---xafijidomojibixumerenata.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/67ea03ce18f6375ccfaaf1835f423607/liwedulejikomi.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/tapokaruvagidirijitidaj.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/fijigafejinef.pdfIn PDF document text
    • https://farmstead.tw/farmstead/upload/files/basixulibefijizotu.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/lirebiboragame.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/faporodetejonu.pdfIn PDF document text
    • https://kawanmto.net/contents//files/vasuleninivekebetore.pdfIn PDF document text
    • https://dineflon.com//files/xonozuramomumagipedutap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=chemistry+for+grade+7+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_off00012688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12688 17328 bytes
SHA-256: 0f9d82838d4f76269600894e85763bc4c4dfba77e11db6dce39754e67e79a819
font_01_sfnt_off00015388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15388 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B9F 10992 bytes
SHA-256: 574791a56fb148659e8539b8fd9e298e9c1fa4e0474deb16f4e65ed220d107ce