Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f002a835c393f7c…

MALICIOUS

PDF

81.4 KB Created: 2021-06-26 03:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c5408f36be2530c7a9037a8122920cf4 SHA-1: 3bbf0013c27e9b8a8faa2f6926635dd31ec0af8d SHA-256: 5f002a835c393f7c364487cb2d3bd507ee675db46691544ae09992f98b57f585
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malicious content distribution attempt. ClamAV detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', and ML classifiers also flagged it as malicious. The presence of numerous external URIs, many hosted on potentially disposable domains or compromised CMS uploads, strongly suggests a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/vfo4sbpuln5e6im1kbhue193v0/winerepevoto.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a7474c13060a9a6ecf57f1b6661e8e95/zabaxob.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/g200889j3j243ui6o2pib13ob5/87926248484.pdf
    • http://scvumaichiramen.com/uploads/files/xexosisasinulipun.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609534c5d76d7---kadinolifesunaxovas.pdf
    • https://pristineleather.com/userfiles/file/6301038795.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/0bb6552413518cb961dfd4bf58b3a23d/59619963495.pdf
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/buxulim.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a214d5b2b2f---7734130341.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/88fc0d3cb3ebf53f9e6a035dec94d34d/mulajijuwovojonanil.pdf
    • https://contactfm.be/userfiles/files/76836548934.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adff6b10232---nomekinaretafizuzadir.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1a743f113---vafonub.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/17294861e692aed733ff5579c8e7ef65/96027074263.pdf
    • https://ideylia.fr/uploads/file/90893672856.pdf
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/tanemajidabej.pdf
    • http://partnercable.hu/files/10179899932.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/0de046c98091001cb4683acbc5cacba9/welufomovu.pdf
    • https://argekaucuk.com/nbg/upload/files/83413526.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da7a9687a4---37500393224.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/7e4d9093082378db20d1716a59eb87d7/suragamamevuvisepanexofas.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/c3ed8733687d277a6d5717a2535f7d5b/23205777505.pdf
    • https://abicecream.ru/ckfinder/userfiles/files/85455526497.pdf
    • http://asja-doll.ru/userfiles/file/90907738159.pdf
    • https://efficimm.fr/userfiles/files/jilolujazesakifodajowabem.pdf
    • http://alisawedding.com/upload/users/files/12379439900.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=chapter+12+critical+path+analysis+answers
    • 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_off0000daa4.bin
16928057fe68155fd72a94c73160439de3a3bd4271720a956eadfbcf8eeae2cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA4 16980 bytes
font_01_sfnt_off000106c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106C1 16792 bytes
font_02_sfnt_off00011ed8.bin
0ba58b6466bb5eee8460a51a0e7c2f00869ec807a035dd5e8f95fca5b7c8cb7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED8 10756 bytes

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