Malicious PDF — malware analysis report

Static analysis result for SHA-256 a357b96464bc276c…

MALICIOUS

PDF

69.4 KB Created: 2021-08-28 18:19:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1b35b46dbad62902ef37708aec6c8a91 SHA-1: 30b865f2e0355efa98d10cc3df5a6d6ee15d46b4 SHA-256: a357b96464bc276c663380d4ec39539e6b0bf8c88569578de9c3050d5fe57fb0
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://lesfeesdelhetre.fr/upload/files/kavevam.pdf In PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160980cb12d581---75964131865.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/pomisuzazesisojamopaxu.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/59073040030.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/t2k5f3kmif41lcur5fp2vatslr/82962039349.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/67680310019.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/48989989171.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160df35d945924---matajutenuv.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/25551960251.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/pijilowapazizozi.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/ladijoj.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e22430610ea---paberumemivewikil.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/20288546257.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/widafog.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/vmqfl7ukmk980vib4v5b822t02/4092473719.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210620210846492.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/gumitovijo.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/1927774578.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0159889001623677332.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160943d8827a30---devesekejawejegivigar.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/507f387acf5b4e26dd06c7bc6842a1a1/45602302479.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16094abfae750b---wapolifujisid.pdfIn PDF document text
    • http://nipissing-lodge.com/clients/b/be/be32fa5c9d1e5a871f1efa0d35b29fe7/File/rapuvozepodu.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/72368688679.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///531596875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=toby+keith+americanPDF 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_off0000b503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB503 14124 bytes
SHA-256: c663154d128d539e42898fd2c4b720021c5ec23546f83e304525386107e85274
font_01_sfnt_off0000d832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD832 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF049 10592 bytes
SHA-256: 854776497ed76ee60f94d82c2446a2ce40e5db85265cca4574ce5b3fc2ab9ed6