Malicious PDF — malware analysis report

Static analysis result for SHA-256 b956d6774ca7ece3…

MALICIOUS

PDF

86.7 KB Created: 2021-09-21 03:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 735bfef422c72aa526286831184b2902 SHA-1: f61ebc649e0b65d583a24db5ff9c19fdb55ab12a SHA-256: b956d6774ca7ece3af3120d9246ac439363098a6131470126abfb94f459e93ab
216 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. The heuristic 'SE_SECRET_RECOVERY_LURE' suggests the document's content is designed to trick users into revealing sensitive recovery information. The presence of numerous URLs, many hosted on compromised or disposable domains, points to a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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=android+studio+generate+getter+setter PDF link annotation
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6859f1026---xelujopuxosagoxatadoxo.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/31731894903.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/suwebe.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/82074577806.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/10426868460.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/4642456792.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/61147914788.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/700177b76799f25f769ff44c899c73a1/23317838933.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/makibaruwimetixa.pdfIn PDF document text
    • http://rnralpha.cz/res/file/64086220014.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/kusupuvurewabusutixeb.pdfIn PDF document text
    • https://mmtours.si/uploads/25543352834.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/bidajubigofosinupitiv.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/ce1069632c3d1bda96d3d7af0ab66bd7/rimag.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/serida.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c59174593c---kikadorolikamuwutirerip.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/48228028426.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/27251188564.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/82089373051.pdfIn PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/tutaz.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/sewewosanugitasek.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/53280596017.pdfIn PDF document text
    • http://soles2walk.com/data/file/vovirixuwafepilu.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/xemafibifedavunowo.pdfIn PDF document text
    • https://vientangluc.com/upload/files/wujamofuxivin.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_off0000ec06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC06 18628 bytes
SHA-256: a7f94465f3a7adc63dd32ed2ecb98978aff8952bcf1ffed11805e39285ed1c03
font_01_sfnt_off00011cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFE 10460 bytes
SHA-256: caa50c9b871dd78a5373b0a4ced3167bd062ed4462aea5b8ccb57bb5e4601a08
font_02_sfnt_off000134b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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