Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e64fd0ed35a246…

MALICIOUS

PDF

90.7 KB Created: 2021-06-28 13:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a55a6815ad408d26b085a6bbe6b14dc6 SHA-1: 2e61a49a52aa8761b321c65b8884bff737560152 SHA-256: c5e64fd0ed35a2469da95effead8e5c7e513c73a0e671ab388751a7fe95dd0ef
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the presence of multiple links to potentially compromised upload directories reinforces this assessment. The document's purpose appears to be to serve as a lure for further malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072f2b8a1d5b---dedutijogejuwisoroki.pdf
    • http://lsbwg.com/ckfinder/userfiles/files/20210624/0932167332.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c842613c73---karotumadotunarafurenutu.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c52164c77da---76993192049.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/f9049924f166e23c0ad5ae64b7777d2d/4025709495.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/7500ba783cb9247f952c1838a4238892/90509705548.pdf
    • http://fsoa.cn/userfiles/file/xapubupeliruvosizizes.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6980225cd8---tijowupifasabeme.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872ce5ccf2f---29181695276.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160989f94d4216---86408241229.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608430110a97e---mowopofepisa.pdf
    • http://feynburg-uhren.de/uploads/sukanapigagumukugeladi.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/4da07f7ca11a14ebd400cbee5472acd8/30265798448.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b212ebe77b8---bijerixamutimuwewarew.pdf
    • https://konferencii.ru/js/ckfinder/userfiles/files/robegegapipubakosijux.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e09a9f3968---vujasegukajonenokafin.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab1bc14634---88052159429.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/50818ad8697be30b796419380bb5bfef/rosovejigosogebi.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a5988f8a931---gifutafepozobe.pdf
    • https://mamo-tato.ro/userfiles/file/xobufepom.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3f2a932ee---sigalifuripized.pdf
    • http://gillsandgeckos.com/userfiles/file/36937295875.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/f5c7e45388865b54973bde1b01074b31/bitabapifejarepup.pdf
    • http://ffarchitettura.it/userfiles/files/tokuwozupuwunofutubejob.pdf
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/81340102995.pdf
    • http://stlnsk.ru/uploads/file/61248662552.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=appropriation+of+payments+indian+contract+act
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/feb6d1e496e1182c5654d6c711de6b6e/54104252168.pdf
    • https://bit.ly/2tDOdzQ
    • 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_off0001009f.bin
fb99f7508b0942daafa1ba02f7b156bc29b0eabdc64ac952e1b666548db56640		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1009F 16772 bytes
font_01_sfnt_off00012bca.bin
0a912d150faa98a80a725e9f35f1c5c974f445337e29deff47d81063476c7b74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCA 10828 bytes
font_02_sfnt_off000144d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x144D4 16792 bytes

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