Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2dd7f28170df5b6…

MALICIOUS

PDF

106.9 KB Created: 2021-07-06 06:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7d260fad26767d6062cb7baf62901264 SHA-1: a8f2ffd1cc0f093a267b75483b8cf0e66031b17b SHA-256: c2dd7f28170df5b6803943a9b6a1f8ad56bdbc72b304df89256c79a6d6395769
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to various websites, including those hosted on compromised WordPress installations. The presence of 'utm_term' parameters in some URLs suggests a potential phishing or SEO manipulation campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

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://huntic.ru/uplcv?utm_term=khloe+with+tristan
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec0399c8b1---48334418695.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49edf14279---nerolebimewutenazevud.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-7-6/20210706074437977986.pdf
    • http://bociany.sk/media/file/zepoveduvugiwirusotaxe.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/d6f5b095f14b6624756d69bb17d7c2fe/31861985826.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/balovajadinifokawoto.pdf
    • http://kompletucetnictvi.cz/files/file/nidenalener.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c98a82ec63c---54492041298.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079e1aea692c---74187860486.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e56bb0b8dc---dazabigufivakugobesoviwub.pdf
    • https://istanbulbalbir.com/upload/ckfinder/files/pigazox.pdf
    • http://stark-tools.ru/images/uploaded/vikulipogowexam.pdf
    • https://anukulagrotech.com/userfiles/file/xijuw.pdf
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35391547963.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/cdc808c2b25b50d1c9a0dcf8fb107df5/55191825228.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/37fb4eaabf6fced5e9983c5cbbbcdf7a/gebapeti.pdf
    • http://lnaixi.com/userfiles/file/20210613201959_1744747447.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6c4a6912a---79042963337.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b27e89c9e0c---tideturenavon.pdf
    • http://3dtechgroup.com/uploads/image/files/zagupusinuse.pdf
    • http://thehonourride.com/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/gefobetunosibibazijawejon.pdf
    • http://transsnabstroy.com/userfiles/file/74537364206.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/cea27cdc6cdd1bd52600776b5be805d7/4949373424.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093b5fd6a13f---55668735663.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/b12f15f48948168eccf1f4b1b7bfa573/45405258848.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001287f.bin
fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
pdf-font-stream PDF embedded font (sfnt) at offset 0x1287F 16164 bytes
font_01_sfnt_off00013df5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF5 16792 bytes
font_02_sfnt_off0001560c.bin
deb557add5d9e0cec4f332e14d12876a0fb05df57789eaeb73ecd0c05f121525
pdf-font-stream PDF embedded font (sfnt) at offset 0x1560C 10284 bytes
font_03_sfnt_off00016d36.bin
ab9c48facc422b838eed43eafbc7272004cf1b3169b689362f3c327341bdabaf
pdf-font-stream PDF embedded font (sfnt) at offset 0x16D36 18144 bytes