Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0bba223c354ef7d…

MALICIOUS

PDF

113.7 KB Created: 2021-07-20 22:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d1d9b4522c975740fc4d8fa5965b496 SHA-1: 2e3ec0c37792a0fc5ca6cb0b3d20d127294192d1 SHA-256: c0bba223c354ef7d885008aa0ed341c3d06ec0d48bee18c07d3c8aff5cffaf1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. Multiple heuristics point to the PDF containing a link farm hosted on compromised or disposable domains, suggesting an effort to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which is often used to facilitate these redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609df2e59baf8---32062694973.pdf
    • http://biosafety.biz/ckfinder/userfiles/files/59205288133.pdf
    • https://computerzone.pk/file/16139456462.pdf
    • https://xn--mietkndigungsrecht-best-gpc.de/userfiles/file/86911391956.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35af1105d7---99077744690.pdf
    • http://poorclarescork.ie/images/56454824548.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/c9fa8d0faab9e9138b349cac8b1b1955/79846285842.pdf
    • http://fouladsazanco.com/Upload/file/dakotesenebirajirutej.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/31b012436644904a304f7cece4ececb6/42368869566.pdf
    • http://thaimassagemodel.com/ckfinder/userfiles/files/gazekimewadiwoderagurafab.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/ufhcet2je9g2vkp507edei2j46/liguzofisufinajukajerixe.pdf
    • http://wowbond.com/upload/Fckeditor/file/23722268224.pdf
    • https://swagath.co/new/ckfinder/userfiles/files/68357931839.pdf
    • https://africanresearchcenter.com/userfiles/file/sotamula.pdf
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/duwoposoda.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/c6a1e6be1cf5c232b3bfacef0afdc1c5/54454240133.pdf
    • http://effektfilm.de/files/file/gojadevabek.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077393f9e062---39942583523.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/c397b522606d538161dedc029f5b9f9f/45867093422.pdf
    • http://posekatzahradu.cz/files/file/77032284728.pdf
    • http://nacyc.jp/Upload/file/beruvogolat.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609456cf9a3c2---78450476665.pdf
    • http://ozona.pt/wysiwygfiles/file/xisosaweni.pdf
    • http://liburnia.pl/userfiles/file/morewibiwuwosob.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=josef+albers+interaction+of+color+pdf+free
    • 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_off00015acc.bin
bd18576c17dcb0d7b979660c7c53b7d290641d01a480af39ffab9ad33007e11c
pdf-font-stream PDF embedded font (sfnt) at offset 0x15ACC 10744 bytes
font_01_sfnt_off0001736a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1736A 16792 bytes
font_02_sfnt_off00018b7c.bin
3c10ed479926e52850878ef5d916ae5df6ff4cccd8392be250c36d5bbb94da6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x18B7C 17588 bytes