Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac7c15297ae82f8…

MALICIOUS

PDF

81.4 KB Created: 2021-09-12 07:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 502e00464b7bcad9fb4b608fe5be8508 SHA-1: 27dd24ca33d456db4b9752a6f3ea08aec10ca720 SHA-256: cac7c15297ae82f86f11d809789c6ee305f22d9e059a01f0f1a5b537242ca39e
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs hosted on disposable domains, many of which point to compromised CMS upload storage. The primary malicious URL identified is http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/bff805b2ccff43da7b609ed9050d08e1/91691390406.pdf, which is part of a pattern of hosting malicious PDFs on compromised WordPress sites. The document body is heavily obfuscated and unreadable, suggesting the malicious content is not directly visible.

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 http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/bff805b2ccff43da7b609ed9050d08e1/91691390406.pdf In PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__6138302FE194E.pdfIn PDF document text
    • https://csodamalom.hu/files/files/70120147764.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/18560745222.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/lujuf.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/36934222376.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/sumajoxuvaxebibokugime.pdfIn PDF document text
    • http://ellev.fr/upload/files/73146768088.pdfIn PDF document text
    • http://markone-tools.com/upload/files/pumatexilukeke.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/24337744016.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/gitok.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/pomejojanubopudike.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/1e42311d36f3b13af714bdbb119fd9f8/84108079722.pdfIn PDF document text
    • http://klientskazona.radeton.sk/ckfinder/userfiles/files/mafokakibaf.pdfIn PDF document text
    • http://mdtrend.hu/files/file/pejapewemo.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/pamulinekokaxogomekib.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b80cd62791---44514316483.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/74065408973.pdfIn PDF document text
    • http://samtekelektrik.com/files/wuzurix.pdfIn PDF document text
    • http://tavio.su/files/file/4902609864.pdfIn PDF document text
    • http://djapm.com/userfiles/file/49728920020.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/gajerupofeteruvipewisura.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/dariwivatojaxavipiwidawi.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/73176021355.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/68996884567.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/xitawasunuderikabusalisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=miraculous+new+york+online+freePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC5 16752 bytes
SHA-256: 2221c45285ed3d3ce7012b8c58c7d93278d9c2e1790251ff863e3eb9372d9f9a
font_01_sfnt_off0001075f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F76 10616 bytes
SHA-256: c2d58fd5b3e45d4a24512fc73270ad3b4caa83ba7352cd1a1db87d1c60246ee5

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