Malicious PDF — malware analysis report

Static analysis result for SHA-256 d828ded8f82153fe…

MALICIOUS

PDF

89.8 KB Created: 2021-08-09 19:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 09dcdbc9e1f7e4ccdc9e7a170d1e1fdf SHA-1: 2373db4705fc15bd2b377bfe799a2bedb51307e5 SHA-256: d828ded8f82153fe32825ee181ef69f8ad36d4ef552e731c98a0cf3b518994a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://hamzsabegi60szallo.hu/UserFiles/File/15321312491.pdf In PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f0886fa64---20139269630.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608407f30787d---66282473236.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/2c3524d9dc41d89368b40270dc982b49/tekobeladutixufesodefozaw.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/54289653489.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07697288d2---pegurokogajikedazu.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/pomirosojamotewefalidel.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/6d3d2ca6b12478e337890b6072d9d7c4/11511248605.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/mozelikinopovipelo.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/84928480518.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716e46ce597---71848323262.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/didopomumu.pdfIn PDF document text
    • http://lhsclassof77.com/clients/34792/File/kefexedes.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609425727ad42---sigajusudigo.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/81e958dc8261856be02c5d2ff8fb925d/35320914946.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/65abed74b524db33f2c22b0f854eb71d/99470066848.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/cds896lcb6e72vqbefimvgh52e/rugaxiwepidoxijoradubol.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe36a043625---68545300439.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/15f343501fe3f483f453922d5d685af7/76954275105.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/6472b1fd34f42f51636924c2fe60fb62/72448697415.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc19f567848---38077783012.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/414140074.pdfIn PDF document text
    • http://plastikacz.cz/soubory/files/manadonotugom.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/mudadabirajamum.pdfIn PDF document text
    • http://sweden2020reunion.com/clients/e/e2/e2375cbe45a1e08e95d3a39ca41e84e3/File/vudobosudigapitared.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+file+for+handicap+parking+permitPDF link annotation
    • 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_off0000fb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB67 16716 bytes
SHA-256: 6af64bd97a0f13b8c8458cee40fbae4ab3dd43e3b6079857b9b0f7378981d9b3
font_01_sfnt_off00012715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12715 11068 bytes
SHA-256: 8e421ae321e9e4fbbb9b02c93ec89784147bb750415e430f52616c6781840b20
font_02_sfnt_off00014073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14073 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1