Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f42d111f7aeca59…

MALICIOUS

PDF

105.8 KB Created: 2021-06-27 21:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bbfdd707b8ee4c4f8d3704fcf428b08b SHA-1: f765369b72a8ad3e418168f441ba58cc8c4def2a SHA-256: 2f42d111f7aeca59a9c0cc017e30cc82a868eaae667bdc7e99a94846ced9f78d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or downloads. No scripts were extracted, and the document body was unreadable, but the link farm and heuristic firings are sufficient evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9687

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://huntic.ru/uplcv?utm_term=words+with+w+and+u
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88a1b4444c---74295595089.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/be8382c1b651dcb65557ed92b658fafa/mibubajuribanotuxid.pdf
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/mixonejufijavatibu.pdf
    • https://egokituz.org/files/galeria/files/48668343410.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ae9a919131e---98818524040.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/tmjn9plg6no2j5de4p8lqb77mm/tapinukugotipupulamewesog.pdf
    • http://traiteur-ribot.fr/userfiles/file/35682275089.pdf
    • https://feltshoe.com/userfiles/file/91681123057.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/6c523cfa1dc936c259f11bbb7063e6c3/87078142958.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de9a84baee---nejiradakuzedolenag.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833440da011---91582564175.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/58795919756.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ac04ef84e---jelodufukebeka.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/d3026e446955d0bf28f69ad0bc3b1911/saderigekovore.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1608933a1238de---27143368715.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/703cfea48b827178c4cc10ee60d3f13c/sabapikola.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/7110355563196b3a0b1325fb5b8f9265/domazilofumagosasetapage.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607886edeefd6---39682739.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/17ce0de61cd1fe9a22e00781437076b3/bibepotigominuxejuwavof.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960fbd598eb---66310791982.pdf
    • http://www.allatpatikapecs.hu/images/file/96181400096.pdf
    • http://sattosushi.com/uploads/files/25741435587.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743703f413f---pogifuzegujotimoxan.pdf
    • http://photou.cc//ckfinder/userfiles/files/tufitovefis.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010272.bin
bc7c54000ed50a3ea94e7e2e681b50114b87567fbf6a9ebc9e3530e7426b6f75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10272 10348 bytes
font_01_sfnt_off000119c1.bin
a891b8f8acbd526f91145c055c0145f0940c33457e563fcfaab95380847d0e99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119C1 2072 bytes
font_02_sfnt_off00012324.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12324 16792 bytes
font_03_sfnt_off00013b36.bin
595bdee089b4531dc07775c6668d77f3219499e6fe8cd18c9882445dc70488f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B36 30312 bytes
font_04_sfnt_off000181db.bin
efad4ea12a89bf9f4fabeef541cf0df09974cae4e76a7ef061ed290062217724		 pdf-font-stream PDF embedded font (sfnt) at offset 0x181DB 16540 bytes

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