Malicious PDF — malware analysis report

Static analysis result for SHA-256 eae7b7afc1a8444e…

MALICIOUS

PDF

83.7 KB Created: 2021-08-17 07:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e388559b59795ec8c1fb8397e820d72c SHA-1: d5d2ad5b1e889ae41bfa60a0b91359c9306c86b1 SHA-256: eae7b7afc1a8444e862dc39bfb3705e58d1bbcb3ecac434824ee3c3ec5d5bd81
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to multiple disposable hosting sites, with one URL specifically identified as a compromised CMS upload. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade gateway scanning. No scripts were extracted, but the presence of embedded URLs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://daiichibus.vn/uploads/news_file/nozakawonemevelepudawo.pdf
    • http://ankurgroups.com/userfiles/file/20013454911.pdf
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/83554618952.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/h7v53iep39dhtkj8h1l1ujann6/levidasurosakuzejetime.pdf
    • http://vtvxm.vn/userfiles/file/79068305713.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/3f314194554ba65d74fc1d44619c77a2/vuwukudogonadasezad.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a32542a3432---vizodi.pdf
    • http://clubsahdianagalati.ro/upload/editor/file/xilamijivizekifunurilut.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/53122569fb70daabe56644ce0c5c590d/dolodonamipozodexat.pdf
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/togujem.pdf
    • http://forglass.sk/userfiles/file/39984735155.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/4a7c9a2c3d20b6c9249902fbe2af8308/majitaw.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719299ac42d---24382802404.pdf
    • http://sarkanyhajo.hu/files/file/darirubuneviwa.pdf
    • http://atrsara.ir/resource/files/pudilumuvexamejakuxa.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dcf68bf41---6496565660.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a8e57c69a---vunuzadomupasavitimilemis.pdf
    • http://stonebriarranch.com/clients/876969/File/vivopolefiminunisatu.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/gqjs3ddi0ojhsa6mm2s951eh85/jororatagejixi.pdf
    • https://kristinanamaste.eu/files/nobolezikevadolonasux.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a0613045e7d---65486995887.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a34c9b6cc1b---21746507184.pdf
    • http://barrybusiness-crm.com/ressource/devis-photo/files/kibusoke.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=tarjetas+para+desear+feliz+navidad+gratis
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1fa.bin
4836271cf7446d456fb57d002ebddf92e3dc0fa83ac127af1a27c08c75094ed8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FA 17164 bytes
font_01_sfnt_off00010d81.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D81 16792 bytes
font_02_sfnt_off00012598.bin
77735d57a4a05541ff6ce959ea5a87c4663eb02643682b8c9f4be448368c087b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12598 10772 bytes