Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad20fe79b5749ec…

MALICIOUS

PDF

93.0 KB Created: 2021-07-10 04:19:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d7f33eadb376b1beef056eaa87ce0bf1 SHA-1: f820025de39ebf9906aba73944b0f8e4c57bfb60 SHA-256: 4ad20fe79b5749ec0824006e0b2173108fad3576f493e9b30df03a126120f1fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing a link farm, with multiple URLs pointing to compromised WordPress sites and other domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect the user to a malicious site, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://philabc.ru/uplcv?utm_term=justice+select+committee
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/1a5a409c756f3b33cd67f5b70b461d9e/jobali.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7288d3d75d---4303217871.pdf
    • http://thedewakohchang.com/image/upload/File/3310100953.pdf
    • http://beachfirebrands.com/userfiles/file/11866153093.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d903d5de8e0---zebomamajujor.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/d7c14c9a9daea204e54b6ce345dc9544/jalunib.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/e31bea12cb835098f4a5ccf80931207f/zugogibunejuzojilimis.pdf
    • https://gannat-ltd.com/userfiles/file/gapimadepabuladof.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a564fa34ecd---sakibi.pdf
    • http://cafemsoffice.com/userfiles/files/wetoxubivexonomuv.pdf
    • https://auto-rujo.com/images-editor/file/bowesatojapabizig.pdf
    • http://euro520.net/userfiles/file/16218902561792843418.pdf
    • http://maychamsocda.vn/images/userfiles/file/22333990969.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/ec03571797cb7e88b8b393f55432a1e1/mitekibelomobumupere.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607482a25b368---vaxodubawetiwo.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/20a78e24ab3ea49b7c415d55936eaa21/86053569051.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b37f9b3dd2---domopijas.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087890516cbc---koraxedoxosubelovipi.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b904fed7a12.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/fbcf204f2413ca18acfa8079b99dfe1d/43223826558.pdf
    • https://partner-support.net/user_data/userfiles/files/fimiregujudas.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b26ed1ac164---japajugopigul.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/01d1c8caf103267f678ca7c229ed0c05/42126609611.pdf
    • https://sunnyvale.com/wysiwygfiles/file/tabaxazejup.pdf
    • https://emprenderem.cl/files/36956835983.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/vc3h3pmm1tof00a2bf8c0cgemf/darubupajenoxipili.pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8d4f6a1b95---70997310929.pdf
    • 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_off00010aa6.bin
a43384dab444744236672c836ff8cadd538d6dbefc1b58a55f45249cb50c6767		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA6 17232 bytes
font_01_sfnt_off000137ea.bin
bbb2b3d551f0c7b08462f3e60e20b9ab22e959ebdd57d06b177ba8d1650b573d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137EA 10116 bytes
font_02_sfnt_off00014e98.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E98 16792 bytes

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