Malicious PDF — malware analysis report

Static analysis result for SHA-256 dca379f40e51679f…

MALICIOUS

PDF

72.5 KB Created: 2021-09-20 23:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: addeb0bcdc719fb2afe31f7545f20792 SHA-1: 7ea45ba780fb0ab0db9105d13218461b2977bcd2 SHA-256: dca379f40e51679fd186cc92ac8d075b200c8824f1ebde11a14d49c627798af3
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to potentially compromised websites or disposable hosting. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this is a link farm designed to direct users to external content. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 5

  • 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://drafthe.ru/uplcv?utm_term=pokemon+emerald+version+cheats+rare+candy PDF link annotation
    • http://wsp.pl/userfiles/file/garidini.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/monisabo.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/xamilusejanekezojapirujat.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/68241150190.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/398100dc0a1199d60ebf36d93bbaa0ce/mukapuvet.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163053778741.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75646178090.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/45270163679.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/sigoviwuregisu.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/34287980478.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/josojatusenorogofeseji.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/dixemejuzoxuji.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/tebazexalunexitozuba.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/01ce6f9b4274d7fe87758a3a45ecb7cf/gerapotugefakixelopexef.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/34954875976.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/jojasemixezaxemeso.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210914143521.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16140bc19647b6---11552560628.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/101e8bd27935d385206cc0a02e7e163e/86531196445.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/41399160410.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5b026d0c8---6846906274.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/40693692188.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/pusaledexemorev.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16137fabcce4a3---kifixalitataliliki.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/49509300602.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/94350985830.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/lexadelufivofusigovuf.pdfIn PDF document text
    • 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_off0000b748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB748 10908 bytes
SHA-256: c15556111fbee0a1c4532b3d185c55fccfdf01c66a84256416aadde3900cafe2
font_01_sfnt_off0000d064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD064 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE876 16708 bytes
SHA-256: ebe26e40a3c89ff8e183beb19a6420ef964290e297fbf0ca856faa2948eb5af7

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