Malicious PDF — malware analysis report

Static analysis result for SHA-256 00dbfef78dae716b…

MALICIOUS

PDF

82.5 KB Created: 2021-08-03 05:35:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d399fe14f8ae4f31061c9fe265c222c2 SHA-1: 1b065d48897fcbf16b28fe859cae66c1c4cdc315 SHA-256: 00dbfef78dae716b9f9c9596c4e8fa59da39261740a17c33c6830a06e593ea9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting domains. These links likely serve as lures for phishing attacks or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=cu%C3%A1nto+es+7+pulgadas+en+mm PDF link annotation
    • http://slanfusa.org/clients/47225/File/50743303965.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f831dafb57---37651612091.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/98971281598.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/99850590615.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/lonodavutanikivogonotonev.pdfIn PDF document text
    • https://aedwea.com/upload/foto/kuwos.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083809e89ee8---46674789244.pdfIn PDF document text
    • http://carolinaboatclub.com/userfiles/file/81012731437.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606cd90f61dbc---26472750211.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/e8170183ce04629a898f7121f6edc860/99363502878.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/75416643268.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/gthb7j3289qucemr6d73iktp98/bunagubakubis.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/62065445280.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/97582720131.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607180134a4cd---78411505859.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/0c36c27fd52cd9a1f966e2324d04910d/75755360095.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/67346192138.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a69222cc0---32047101588.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/87242504563.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210718_AA2D3FAC8CE38C63.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/32412174199.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e559ac60d6---76378977048.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/69623344.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e534b218415---43959566227.pdfIn PDF document text
    • https://le27.fr/docs/file/21635746216.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/2154233310.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_off0000e19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19A 10904 bytes
SHA-256: 06ffff85fd72d37c1405d5a8f4c11e5e0fdf19398731dfcc994a7f32e7eafb2d
font_01_sfnt_off0000fa5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5A 15996 bytes
SHA-256: c711aa888487cecbb7da84052cc0f02ac4a672d7fddb87ca50f256b4c08c14bf
font_02_sfnt_off000122b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1