Malicious PDF — malware analysis report

Static analysis result for SHA-256 c350189425b2414d…

MALICIOUS

PDF

70.8 KB Created: 2021-09-29 00:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4cf825c6aa9a3dd6790d2bfa3a75e1f8 SHA-1: 7a5b4026483b1cc8522c628ed39df3254d7efd1e SHA-256: c350189425b2414d87894eda287d05ce988c999ac6959f676e0e9a7b24a899f5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic findings confirm the malicious nature.

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 http://sictombbi.fr/ckfinder/userfiles/files/xojumixuxowulapat.pdf In PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1615215752209a---dofakemuwuvimu.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/43607097750.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/wefuxiligufemexijawabexo.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/fafifevexobetedidafenu.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/botosoradupomasomukosevid.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/zisumexejunatoxo.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/zevigori.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/23252423983.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1615216ae169dc---tepuzodujorulebexepa.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/tesinawej.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/88226107561.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/48276958941.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/rapukunijatadanonowijew.pdfIn PDF document text
    • https://hyper.oneewe.com/_img/files/48949853828.pdfIn PDF document text
    • http://sushifactoryazusa.com/uploads/files/segewawipuvev.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/46913891325.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/29093095020.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/kipopox.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/73760970821.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/2039686194.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1614d52a0255b6---48642404563.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/bupew.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/famirufebusijisetifa.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/53563034473.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=install+android+os+on+pc+without+virtualboxPDF 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_off0000b3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A9 15464 bytes
SHA-256: b620c887dc434697b901a7414746ae6459c0beaeb6a0ae96b91d563d95108590
font_01_sfnt_off0000da2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF245 10924 bytes
SHA-256: cce63d3c2444e42d092740684a91a9ae578592fe006f73652ed3d2bd97aa495f