Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0f034f95437aa7d…

MALICIOUS

PDF

82.0 KB Created: 2021-07-02 00:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 518939d9dd218a36322b5fb81307a42b SHA-1: 5236be87b7657382a95585ea7af5bc879b7fb72a SHA-256: c0f034f95437aa7df3c43eb84c4495bcf4ceae2b39fd6c7549e21aa92364eaad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary attack pattern involves luring users to click on these links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://kinel-hunter.ru/upfiles/file/43992590480.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4a8d9ec62---rajosapixelotofom.pdf
    • http://baigeleather.com/userfiles/file/vavibamixijuvija.pdf
    • http://alhouti.com/userfiles/file/webokezewagapu.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/iiqtksibp8aq6gjachpe28b0q6/zusepulawapejofi.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084f6fcb18e5---pujepesizavakise.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba2a0c5af7---49405396917.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/7n5cd9piav6s489igkp4kkl4ad/84441647781.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0b00ecc0f---subugawiwufudejewolod.pdf
    • http://aftckwt.com/uploads/file/9377726856.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/6ag2tq79q0p8vt1nfaa17eb4i5/kujozu.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a67b0f4da---80444164832.pdf
    • http://charivne.info/images/file/mazipejufovopexuleza.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160770b35da530---46324243194.pdf
    • http://naturallabs.de/userfiles/file/49541908723.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce9152456a6---2130479287.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/c70d51d8c431cecfe9d11ae966a52e75/pilisuriladavuditukepena.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5ff292314---88853176192.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/76829689421.pdf
    • http://csc-020.com/userfiles/file/20210630113230_kdcjtu.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607587b64e17f---21635978872.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a440db315d---15748147474.pdf
    • http://thementalhealthadvocates.org/files/userfiles/file/getezariduz.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e868b5c87---39555802302.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/ff2e8539aa3b9b08d3418171e3c600ea/zejadopo.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/03673842d12dbaaa6f86eb0073be3320/17310289737.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160702d2f5002a---70324679554.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=decomposition+in+nature
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0c1.bin
4b8b726bb77f769af4b7be4f60521e993d083302b9abc6cfb7e7a87604e336b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C1 10588 bytes
font_01_sfnt_off0000f8ea.bin
942b2869b2473d194a249b7cb6a49c21e4c87bb5931e12f2bd0c3054f144429d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EA 16256 bytes
font_02_sfnt_off000122c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122C0 16792 bytes

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