Malicious PDF — malware analysis report

Static analysis result for SHA-256 3818f11ec7ba34aa…

MALICIOUS

PDF

94.9 KB Created: 2021-07-01 13:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f883369558b551a1e3c86a0c9bde7dea SHA-1: 9f40e9f41d45589955a22b690f10ba946f583dc4 SHA-256: 3818f11ec7ba34aa5c5204b24b3ee8d263626f6fd13d602405b05acc031cda16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm intended to redirect users to malicious or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://pistant.ru/uplcv?utm_term=variable+separable+examples+with+solutions+pdf
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/64360228509.pdf
    • https://castilloexterior.net/ckfinder/userfiles/files/filijufelusogutizijerudi.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/aa2776f3598962596b34681225bcc220/vuwebatowedik.pdf
    • http://rolmech-strzelno.pl/Upload/file/lowopezimokom.pdf
    • http://goldartline.ua/userfiles/file/wukamuwonevokexajaju.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/5c81c0588524775cec982a41a0beebda/24050009596.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/6rceurtbcopi29de2imm7p4i1k/kipetopizesetavitebogifu.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a7821f145d7---misopavelokegoge.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16071d2578bd34---67093415429.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/66016689732.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b391152ca---25292882844.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609de622bcc4f---vadaremesukenemomej.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/734198f0630acf050c9fc6e249dd7079/64016034019.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8facbed94b---bosidovuxafadog.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/79c888bb6c7b20f04af7a45878365d25/96158279819.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/86e080eb549901e15fb68cfdb9242c03/jajenigepekaziwemexol.pdf
    • https://foundryindia.org/userfiles/file/jivipabajani.pdf
    • http://esipro.fr/userfiles/file/16434896254.pdf
    • http://myjacksonfamilyreunion.com/clients/e/e2/e2167ce47089e9b789d53270b7cccc99/File/vizilojepa.pdf
    • http://iphonedown.com/ckfinder/userfiles/files/zofoxibezinesimosabikizi.pdf
    • http://contextuae.com/resimler/files/11885590581.pdf
    • 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_off00010e3a.bin
92f2bf0a0e47c5f965296017b80a00082f9914fe0922a039ec48d8877ee43018
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3A 11160 bytes
font_01_sfnt_off000127f2.bin
fabaecc9b771f40cb2c5c985a37b81101884b77f74274eab31bb689dc215d417
pdf-font-stream PDF embedded font (sfnt) at offset 0x127F2 17832 bytes
font_02_sfnt_off00015620.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15620 16792 bytes