Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcc553433bec65d2…

MALICIOUS

PDF

98.8 KB Created: 2021-06-26 10:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11a9b2019c05b3d3b794f9554d2a4140 SHA-1: 206586f892f48d99b2239b42adba569cd1de1af7 SHA-256: fcc553433bec65d28d9762c2fc87758aa61098140b4e52ae93d58a9162c7c223
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns pointing to compromised WordPress sites, suggesting it is used to redirect users to potentially harmful content. The presence of embedded URLs and the nature of the link farm heuristics strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=easy+low+carb+lunches
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16079b49f954e5---55232043879.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfe65ee9fb---zujetufefanupupamisel.pdf
    • http://zrdb-drogbud.pl/Upload/file/temonazufi.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608355e1ee701---limiwedanevojig.pdf
    • http://hanboo.cn/Uploads/file/2021061111361370554.pdf
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce1131986f---fogokirakorivoj.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607751a1993e8---94020394383.pdf
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/faxazedenimazegavewiwa.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/s4gufbf2sq6v629kpgc1pi3q0s/tuxolomowemokup.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb8370b49c---21159188688.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/9d4ee8d75be08a9eb1d86e6ad1dfa243/memafemeko.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bf59caa07---mojixiposerujunep.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/81b713379f6ea7a0b0d2dd6b8aeecdb0/naropokudasire.pdf
    • http://whalesart.com/uploadfile/file///2021061501501440.pdf
    • https://simplehome.ro/ckfinder/userfiles/files/nidajupubo.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0dda56b64---kijofotajefanujadug.pdf
    • https://ctsgroups.asia/images/file/bojunupunuxojelidedop.pdf
    • https://kimtuong.vn/isc/public/files/fckupload/file/20480158478.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071414c98988---xipubiximonomoseroluv.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/bc91201b0787b75d9e5a5f0de552ae72/ruwelipev.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/5chek74nmbpfu1hsrujll5qftb/17753959753.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7722462c4---29581429167.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/b3f67f103ddff42f68be91217269cc3b/zewisesatebefa.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/d502e6bd5da1507c1e6a87108542d28c/20545962446.pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834f7038a9c---55522357034.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_off0001229c.bin
839f81deed15d03d3d1472dc945418513b34b71756164659db6ce6900617216f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1229C 16736 bytes
font_01_sfnt_off00014dcf.bin
f03bc129cd830eaf27829ba864b98bbe9a3f392d219baac76a5f10b9285e2f17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14DCF 10560 bytes
font_02_sfnt_off000165f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x165F0 16792 bytes

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