Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb5faafa37617819…

MALICIOUS

PDF

90.8 KB Created: 2021-06-26 00:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e9ba8134e24cffebb72b7d7c9752fdc5 SHA-1: dcb7436856b17d2c6934e2af00bfc91878d5ef80 SHA-256: fb5faafa37617819ddfbef0141c5254e5f0b61bfe6816e0b04bab87d5cb42d96
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to further malicious content or phishing sites. The presence of compromised CMS upload links suggests an attempt to host malicious files on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/uplcv?utm_term=neo+bomberman+for+android
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d326011c6---25519622404.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82b32544bf---wugakoxapejexelanu.pdf
    • https://akamercedes.com/images/uploads/files/49141840853.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/1baa671afaed61f3b50f7aa41eab238c/63333940773.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf65257c48---34326762375.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160adf1d1d120a---muzatajekabudisamuzonoro.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/nv6ptikvvsic3v0iokotj83611/silelab.pdf
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/zezuwudetim.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae40e4c763---lowej.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/d7d016708d85830d00b6a6cd52d4e992/kovakizobubuxivizis.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a1edd38f4---mewejogikivogofoxipike.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/qp6mt5k71k9m0arcn4viitfvk3/noderumaremitabosadu.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4105ac4b4---ritafova.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/6e0a50be9c2c1bcb6ff98a70851c34d5/22977345504.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd33c29ab---92826137971.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16078a7eaec1a2---rubokemusegobebeb.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/h1phtpd5fb9opu90ld60q3ium3/juzafepimaxapifo.pdf
    • https://kimtuong.vn/isc/public/files/fckupload/file/maxidijufefafofigoparone.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c14b1be7240---81339987575.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/e2565e222c3dbd6f410ffc6d7a2d5306/tidomafebefemamebit.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c144ce0afd1---befobub.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/ad916c4ef85270ea71b2391b4ff1c805/zotofamoketowofe.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99547cfcc---59373662479.pdf
    • http://hodinovysoused.cz/upload/file/gorowaxatig.pdf
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/89003402575.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd62d44eea2---sevunesivukurumepafile.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_off0000fd09.bin
45e0171bfa355b289e502f7b4b98373045fa9dd42cc86b4cdbf62076a3bf3484		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD09 10320 bytes
font_01_sfnt_off00011431.bin
02341f588d058cbcf30edec8d78d28942967d60affc0bb6e3068492248edb038		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11431 19428 bytes
font_02_sfnt_off000145b3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x145B3 16792 bytes

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