Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c601467cac8a21c…

MALICIOUS

PDF

92.8 KB Created: 2021-09-06 10:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 126d84970bc1c6bed168c3a5edca67b3 SHA-1: f8cc0f44afa983b3dfe545482eecb49645d3679e SHA-256: 4c601467cac8a21cd841e0808c5375b66a2f18cd1499e96a8efe150560bffc46
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', further supporting its malicious nature. No scripts were extracted, but the structure and URL analysis strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://dock-levellers.com/upload/files/xaxejefelonazabewu.pdf In PDF document text
    • https://cissud.eu/uploads/ck_editor/files/40354944470.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611cf9f03637b---14879607664.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/24204691251.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/juzeledolozesefepukiwuli.pdfIn PDF document text
    • https://akvaguru.hu/user/file/17973449803.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/lawavusiwede.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/318dcae4443848c7bafae5f2c0a2b19e/xegewu.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/96246039500.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/nejotiwusijoxasasatubamu.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986a86dcf6a---75950438158.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/jetowozadibijaluto.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/789526587.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/vovodunu.pdfIn PDF document text
    • http://17njl.com/userfiles/files/54163250815.pdfIn PDF document text
    • http://www.toptehnik.si/images/kujasaloxiloxeratagolonu.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bca3ad1db9e---82785301522.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/12678579562.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/kivebipu.pdfIn PDF document text
    • http://hospitalityroyal.com/upload_files/file/xilunivagozejumixunama.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/55151915518.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160731136eca8b---morikukaz.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/1q939u6odhu96b4cufafhq7o4o/55378313049.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823bf7adb49---ripelimar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=multiculturalidad+e+interculturalidad+en+america+latina+pdfPDF 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_off0001053c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D53 10588 bytes
SHA-256: bba5455f7bd1b47039e51b209dfaca37738580d9757162f1c2d30ddf31279466
font_02_sfnt_off00013570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13570 18704 bytes
SHA-256: f8a8c8e422b9ae258347758fff4ca03b464dadf8eb97ee7307197bd744d177dd