Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93730de42026615…

MALICIOUS

PDF

79.3 KB Created: 2021-06-30 11:26:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0a21e4e638fc0cd625dfaa4eee3d6061 SHA-1: e07e6bd22847f9c3d79192509bd38cb42d06c3e5 SHA-256: a93730de4202661532044b05bb3659c0f8118ae020cbfb15e65d5192858a46ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://chcial.ru/uplcv?utm_term=10+edt+to+gmt PDF link annotation
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/91128f3515d87df987b22aabc3c85f13/gifasup.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb8f1391e1---92418414742.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ab8b11ec06dd1465713272132567aec7/29106702039.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/15253806668.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa52e2bc06b---74717900036.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/21000958971.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d1fb407d4dd---kamodudo.pdfIn PDF document text
    • http://kiraat.org/resimler/files/41323902117.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/60999780758.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bd83e28757b2d46c35ed574f206dd9f0/xusininiwebope.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077c036a9a52---99276023760.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c235bdc0ff3---54099104483.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/99354586309.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/lulexaxagodonadukofitefu.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/92901365242.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e7fa78cb4---dukolunuxot.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/0b611eb2899860990b00eeacea427c3a/19090169084.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/5jlmm44n3548s6gmsv2sl9p1g3/44154204036.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/nokitopafimaj.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210529081949.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2be1ee766---6837990404.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/fakurefir.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/9be12915668f1c09f7350998e355e63a/vizolitemol.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210610_9756FB2CF4BEC631.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e546149f1---17236222187.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_off0000d3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EF 17532 bytes
SHA-256: 227967e731adb69bfc2b96178a6ae881f03faf71e1f9cbadd562774adbc0318d
font_01_sfnt_off000100e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E6 9996 bytes
SHA-256: e4eccf5a68b41f2db399873f5ee2a0b58179ed99779eb0f267c8b5547ea120e5
font_02_sfnt_off000116dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1