Malicious PDF — malware analysis report

Static analysis result for SHA-256 bef7966ec7a1c4e9…

MALICIOUS

PDF

114.8 KB Created: 2021-06-27 03:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b2100bcb7c91d13b987a3b629c0eb123 SHA-1: 3b2584c17dce3a9fbdbf39799b74f5d2d44658d7 SHA-256: bef7966ec7a1c4e9d89487868606e4549388f8d368a1ab13cc020ed4d46f0ed3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. The primary purpose appears to be directing users to external, potentially malicious content, leveraging compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9639

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://krisoc.ru/uplcv?utm_term=css+selector+div+with+class
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b19d15bf21---pafinebubalowub.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16089ee048fe4d---37898065407.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082e6e753242---1314559880.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ca3db8c48---vipulimesi.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608573e672c3d---58077910536.pdf
    • http://imhyuk.com/imhyukeditor/userfile/file/20993554871.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/95f823594e793b5f9a86f1307d79667f/suwuzamatodevekiduwo.pdf
    • http://africareview.in/userfiles/file/gipapo.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf230b683e---zilokuvudegixufol.pdf
    • http://pwmtqatar.net/userfiles/file/zanemimixazu.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/9c45d02aa925a214a0ed0c284317407a/nogekemoditidefutukozu.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097909b754ca---22514314065.pdf
    • http://secretlove.ch/ckfinder/userfiles/files/xijabowename.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/f3cda2070a5434b8a10d0d50391dc39d/32867236349.pdf
    • https://footballsod.com/images/ck-uploads/files/wipujomakoburofivozi.pdf
    • http://www.darvidproperty.com/news/file/fizurolevabagutatumi.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160abdc40863d6---54502028577.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/25b3c71a2d3b416ca7b63bf0522b989a/20008144406.pdf
    • http://industrialdevices.in/uploads/72841529597.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2943b0f66b---81475704606.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607042ca863dd---bemalifaxolivulurumigoso.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a177cd1c7c7---jewiwolajipepowu.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870b90a4f67---vesobuwoverag.pdf
    • https://heatingboiler.ca/fck_upload/file/lazupulumojuwome.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160809addc08d4---dajumaxenitumi.pdf
    • http://nakatka.com/files/file/40257372744.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16080f68c5921f---99317593472.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001452b.bin
9d763fca88040e8d77f36ac7bba5956f662cf4008229de5031192e15ff1a6ed5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1452B 18828 bytes
font_01_sfnt_off000177ab.bin
0e3d63f173342003c62a86c726d4d5a85e7f52d44cf06618766a4fa08a0866bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x177AB 16088 bytes
font_02_sfnt_off00018cde.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18CDE 16792 bytes
font_03_sfnt_off0001a4f5.bin
983e19af068d8d627a2a3d78d16cb3bec6d7ef6b9c449a33f4bcbbff404b60cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4F5 10548 bytes

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