Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b734994afc4609…

MALICIOUS

PDF

81.7 KB Created: 2021-07-29 18:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 476ee680ba9e5ea8118285410bdeef2e SHA-1: fc57e6fd4943deface66ca91dfee9e4e984c1fbd SHA-256: d8b734994afc460916cf38663c0bd12b3e7a40617be85ff2a503342625361022
156 Risk Score

Malware Insights

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

This 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, with many URLs pointing to compromised CMS uploads or disposable hosting. The document body is unreadable, but the structure and URL analysis suggest it is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a38c358ebd4---jetisow.pdf In PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160adb029ed603---27095935122.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///rimogatitulagikiw.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160762f279c808---57100542286.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/2ecb08ee763cbc50a7b8fd4db1487eac/24262643384.pdfIn PDF document text
    • https://produsedecopii.ro/app/webroot/files/userfiles/files/27512704491.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/kexixabukodefaxoxuzufug.pdfIn PDF document text
    • https://vestol.bg/files/file/42107115134.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/59dfcad03326ddfca7d76a133df46e4c/selibivazegopobosuwa.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/56274298654.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/nokibanufe.pdfIn PDF document text
    • http://islandpointfl.com/userimages/81536480753.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/pesopo.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160837fa0d30a9---mopewesib.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16102cb876eb33---jafuvawumurobulapife.pdfIn PDF document text
    • http://cortabellanews.com/userimages/46114945853.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/2c623089ed36258c72ff4fa92ad69335/zavomo.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070357e0e602---nimometusekuzebufuxugi.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd31ab7062---mowebuwasewijadikuvu.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/ahul2tb3a6surmt222kij6qdh4/zedowa.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/53871917380.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/retowesepebinitezitewiz.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/rupofafebigixitidokulow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=processes+systems+and+information+an+introduction+to+mis+3rd+editionPDF 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_off0000d75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75A 10980 bytes
SHA-256: 249f71f0b6a214bfb10c43222a11d2db284826082c62ca5856f3fd028ffd27e0
font_01_sfnt_off0000f0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EA 17152 bytes
SHA-256: 3996688956b8b6d34b4004a10e9f218361f01ee32def46fd31cdd7fd31893527
font_02_sfnt_off00011d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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