Malicious PDF — malware analysis report

Static analysis result for SHA-256 e44696d5105a0faf…

MALICIOUS

PDF

73.6 KB Created: 2021-10-13 23:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 49f654a3902e82f108dacf20e1a17d6f SHA-1: 4ff3e2bbff3342d2911e223782982b3d1b7053ac SHA-256: e44696d5105a0faf98c337da800b78c5d0f7ee42735ad0b6ae44b737aed58e22
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous links pointing to external PDFs hosted on a mix of compromised and disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing or trojan payload. The presence of embedded JavaScript suggests an attempt to execute malicious code upon opening.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://amandatour.ru/js/ckfinder/userfiles/files/miratalobobab.pdf In PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/1841043376.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/a06663b0417e531d997e1a3fd189582a/fuwozetol.pdfIn PDF document text
    • http://sms-dk.com/FileData/ckfinder/files/20211007_E6F12C4A620AC2CF.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/ruzefofajuluxasowulob.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/98683138862.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/kukaresokatumogo.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/31285716046.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/koxobedubokolukozo.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/mufesalatefaru.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd1c76c1d0---refanifasojititafugis.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/bedewaropivaxilamezulisod.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/73529823912.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/55615367929.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210902201657.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109041608093186.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/wenib.pdfIn PDF document text
    • https://jck.ro/userfiles/file/49221307575.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/49949340011.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/zameda.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b9160f10a---tosejefapo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/tgwjJlsMqHc/uplcv?utm_term=solving+and+graphing+inequalities+worksheet+answer+key+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_off0000bb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB5D 11456 bytes
SHA-256: 27536ee955d41c6af8b65de4866ee368042a484f57d61236429b07bb7e649210
font_01_sfnt_off0000d5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5ED 16584 bytes
SHA-256: 3ffba20508e5573648b6e18935795d81b27cd0e6b7296b57b75b04e1f089398b
font_02_sfnt_off00010041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10041 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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