Malicious PDF — malware analysis report

Static analysis result for SHA-256 249f486a9cb86175…

MALICIOUS

PDF

86.0 KB Created: 2021-06-26 11:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a8fa906fb68411a12d0b8833935a24a SHA-1: 649ecb737eeeda8dd19fd18b6c2383b99dae64fa SHA-256: 249f486a9cb861753708c4abdf3b48572f2ad51b4aa100f0a929165ee64a74e1
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3360bf2014---94277009967.pdf
    • http://easyreturn.store/userfiles/file/83787837644.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/c46536ae323739762f9b0ad4dbb3643a/noraworivaguwevudo.pdf
    • https://tyeetomsfishing.com/userfiles/file/dalagudivifuradokejif.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/8gsba7kgo4d51plnmb57vldr7a/bijubolo.pdf
    • http://tao123.me/pro_pic/files/60730899391.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e6cbe94cf---39352114375.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/408cc10e71d9aec743ff0b338120c2ea/givofufesoxu.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5f5b382a3---85341517856.pdf
    • http://albertopizzetti.it/userfiles/files/mukinoxanupuveginamewufaf.pdf
    • http://avandcie-automation.com/ckfinder/userfiles/files/54017041785.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/f6v7lgshcn71dl8q0rgpcdv628/teturifosigatoxovag.pdf
    • http://barcelonasixtytwo.com/userfiles/file/zajek.pdf
    • http://augustaelectricalwork.com/editorData/file/lojozemepiwisabe.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/21c52c4118c966685a2257f0898a0d03/xeruxewolejuf.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/7e8e3789b0401976172508d9cb426120/2160402227.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b821c64faa5---limabujapuw.pdf
    • http://burchiellati.com./file_fck/file/57718626476.pdf
    • https://aspirans.com/files/file/lovozujelotetagozivozupem.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/jmnsfd6id9tn391s13bp9qhla2/diweripotasukibisex.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/d47740208e2eaf2be6f318c2697c6e92/15820149934.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0da32de41---zujaninew.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/59586352266.pdf
    • https://swift-tw.com/lcc/upload/files/90532088677.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/b87c5c5c0f4b11b465829ea3677d9610/29189043107.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c94a0e96ba0---nugafuvifev.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/a22f6db914c2ce95cfb69fe6ec9b717b/10057244479.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=divide+for+class+2
    • 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_off0000ebdb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDB 16792 bytes
font_01_sfnt_off000103f2.bin
75866319ed7292f7055febfaefdfca8a696b0a359fa4622bfe1adcb561bbcca8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103F2 10452 bytes
font_02_sfnt_off00011bd3.bin
67389c4558655e996b904a03dba756f82252907aff8b014a5524e435b958ea8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD3 17784 bytes

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