Malicious PDF — malware analysis report

Static analysis result for SHA-256 e10a0d58774ad76a…

MALICIOUS

PDF

82.6 KB Created: 2021-06-26 00:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d959058034f187248636e60c4ce3521f SHA-1: c58acc0f737611f32bb902ed8cca2e806f01f61d SHA-256: e10a0d58774ad76ac957d979d78f857dfb9421a0d45280950054440ba2363f0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS uploads or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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=formula+to+find+the+volume+of+a+prism
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67891397407.pdf
    • http://jagodkaprzedszkole.pl/userfiles/file/nubezavux.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d03c43c763a---mufinu.pdf
    • http://bephoangdung.vn/uploads/ckfinder/files/4235669257.pdf
    • http://stromzeleny.cz/file/72115961878.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/3299199fbeccdc114861fe0bdf911784/84077867696.pdf
    • http://aliotoconsulting.com/clients/862286/File/59247125748.pdf
    • http://askort.pl/Upload/file/xubudisexiwaxudusilojufe.pdf
    • https://alixdemassy.fr/userfiles/file/zusowefarav.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16092d431c69f0---tuwenazuwelimosonajapivu.pdf
    • http://uniroll.pl/user_images/file/1710071629.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00a431fb39---gavitobowudufajig.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/a587b9f7eb7dfa07608d330527bed433/37851541947.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f69e5f74a---pisudolavufupatiburuluji.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/cdbbd3cd5c981ec33000c8a92cf830d1/muxar.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/3f71d7e52f9d78cdbdfe5e44470cf590/defobedanebotebidati.pdf
    • https://betalinktech.com/blmedia/file/rafodujuzozotepabi.pdf
    • https://bettyloupaints.com/userfiles/files/makivonevuneju.pdf
    • http://ytbozhuo.com/upload/file/032305508394.pdf
    • https://akamercedes.com/images/uploads/files/84976715558.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a96758655---devez.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb3db792e7---pezitemit.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_off0000dc4a.bin
2b6a97c72d9db04c9575414e1c8913812c99f957a020e2903d328311d540931d
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4A 18048 bytes
font_01_sfnt_off00010c05.bin
2f02b8a10991778324b0d2ee266b564a136a82dd58d69b98ee369f9107d75708
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C05 10904 bytes
font_02_sfnt_off0001250b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1250B 16792 bytes