Malicious PDF — malware analysis report

Static analysis result for SHA-256 e042bbff792b567f…

MALICIOUS

PDF

81.9 KB Created: 2021-09-04 15:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 501fdde19578c4804f65f6517d6a8b43 SHA-1: 2a172b8859ed1e90fc7a83cd168f4d9904aceb94 SHA-256: e042bbff792b567f4af83b3cccfc978a9d6e406605b78cb32e1cc2f26c07fff0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://kozhikodedeaf.org/admin/my_files/file/mukoraposekonajo.pdf In PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021526121113095.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/2bef44ceedd2de03d55976a724f6ee19/29420950557.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/60199116407.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/xenoseluxuxaxe.pdfIn PDF document text
    • http://eventechsite.com/files/files/neliwa.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/27359259937.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ff9819766---93307555724.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/93320649012.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a934671e7---44191679282.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/tuwanus.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/voxotebejigiju.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/gejolusidexudokesanozarez.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/livajexowakisatemobogatiz.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/jqgnjqmnblmm9uf0u2ps2kpn63/voxesalekitixobi.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/80804017982.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/4d9eed30fc0eb2513ebf4157fa2417b7/tevezeroxotodazirepe.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/76606979707.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/zubixabob.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/mobek.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/cba5d1ae33947fd803b4e742d463da8b/damofitozazababokix.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/33d120ec7ace71d1b732724f598f7026/kodosimudigavazimodizew.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/emcaed8jqu7e53t87par2jqhl3/jogebexawasusemobujexe.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/4ed0301f182c1ea1099a67bfef4c58f0/xixudalatobebe.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/88592154950.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609836ee833a6---62490650887.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=a+wrinkle+in+time+book+vs+movie+worksheetPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A6 16788 bytes
SHA-256: 180018026c86bdf5e8877048369d4ec9b55b0d66f8484c9a989ab7d9d65d4750
font_02_sfnt_off00012215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12215 10576 bytes
SHA-256: 42dc8709374c0665e79dfb0a6c8fed62dedff4926ec6d2248d29b2d4ab9e30d9

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