Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec0ca0e1a3400ce1…

MALICIOUS

PDF

69.6 KB Created: 2021-09-13 11:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7c84add462773cbe49bce6eb65b3d7f2 SHA-1: e9259cc342ca3843699f763aaeb3c1688c9174f4 SHA-256: ec0ca0e1a3400ce10b8403b40c87acf334fff75699f50f8ae73d9ce2b07be5a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://pmrs.ps/userfiles/file/zonakagotamajarilujax.pdf In PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/tupupu.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/17040402006.pdfIn PDF document text
    • http://kaies.net/upfiles/file/2089973875.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/80200489171.pdfIn PDF document text
    • http://gro-felix.si/uploads/81860854279.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/ahmebslsfed3vmv414vtp723ov/45787525437.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/zazaxoronir.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/ruzuxufibedoradipu.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/71678783948.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee9ddc6a7a---mazorowud.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/javaxigajenatagako.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/vidoviselugometebi.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/debefuketojurodedixel.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/jokumozedenemumogame.pdfIn PDF document text
    • http://www.immo-uno.com/ckfinder/userfiles/files/47340223686.pdfIn PDF document text
    • http://ashioke.com/images/library/File/51753568467.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368b9d09c30---18301603784.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333a4db1dbb---museterotazimopasuru.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/26015038601.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/wurijanixiwepimesikan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=search+keyword+suggestionPDF 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_off0000b448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB448 14152 bytes
SHA-256: eb6468549e7163d5e4c2b1429bb162152bcc3e5c64266072ffd14d564677abf0
font_01_sfnt_off0000d772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD772 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF89 11068 bytes
SHA-256: ec7727debcc01c05ee6ddaa39bcad0749adcbaf7554a44dabc3d330ce9d50c8d