Malicious PDF — malware analysis report

Static analysis result for SHA-256 c547656b7368f56c…

MALICIOUS

PDF

99.1 KB Created: 2021-07-03 08:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4ed22bf5f681022ef7b6193792424627 SHA-1: 2379989a8badb317d89550c2fd48793926a6d19d SHA-256: c547656b7368f56c7e5c952edac6e07932068e40dcd27c95629db9d2d69f949d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The file's structure as a link farm on potentially compromised hosting supports a phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://citra.cl/userfiles/file/81860206703.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d1c29203e---zojelanej.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c75ce1a5739---44386029248.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086e0e341629---tajeluzusotuxisafadaw.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1ac940a7d---movijadonomekusebani.pdf
    • https://vegan-eshop.cz/data/file/46914030382.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16099e89e35194---paminanevojivibakesu.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7afd55926ad8e1831b101e8343083a1e/6293608249.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8ac622909---daborukikevajujewin.pdf
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/12b17dfa5836e8d0a9c5b4615cc1f4c4/29676873796.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/f31111c56332bf76b7fd4588315998da/tagubedudif.pdf
    • http://tafgambiatours.com/userfiles/file/gadulimole.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/ip4fni6t2k4l7pq3gudkfclubv/zizoxugopepuvizamox.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/548b4508fb4281aa9edf5057ba81efbd/59237414988.pdf
    • http://allycatering.com/userfiles/fuvezetoxa.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608214e4cc539---vekisakasibu.pdf
    • http://studioagronomoserragiotto.eu/userfiles/files/nakevoporixozadugev.pdf
    • http://kiemtoanhaiphong.vn/upload/files/zupobojedefikogaka.pdf
    • http://stonebreaker.at/xisij.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160704394ca2c7---17579365118.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/16fbb728f41768fc2edb7bc7da2756a2/80913632358.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087dfec6c00f---torofisojuta.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f47facedfe---nokiraraworenefu.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609841536faac---roperowupota.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/ec1240b6b8001188f58e8c5cd4f0a6f3/jogepekijotenuba.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=the+tiger+king+ncert+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_off000121a1.bin
d17d27a0545effbe3dd5204b090655dc4307181055e1b3da4c3cdbcbcbf9d67a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121A1 10484 bytes
font_01_sfnt_off00013982.bin
b4ff8a9398b382869898ffe1419dddea9af2a174dd537dfcec7d8b25b228bdcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13982 16800 bytes
font_02_sfnt_off0001652a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1652A 16792 bytes

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