Malicious PDF — malware analysis report

Static analysis result for SHA-256 9305a8d1bd6c80c1…

MALICIOUS

PDF

191.4 KB Created: 2021-07-07 05:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fd5816bf2e1f8e7cf4841e143398e149 SHA-1: 9df249efe2504f7f417ce4fc46cef3c2562f594a SHA-256: 9305a8d1bd6c80c1d7ca7ac37b1cddc476e27e8d9f1dd61930569530c857a270
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised CMS uploads or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9861

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://xn--h1aaebajlcgx.xn--p1ai/sadm_files/gegetu.pdf
    • http://0vote.com/ckfinder/files/pedifabovem.pdf
    • https://infrastone.com/userfiles/files/63646323331.pdf
    • https://cqc-material.com/app/webroot/userfiles/files/27954575814.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/994ab2790c8feb46c5ceb4b7bc74e855/99560416297.pdf
    • https://zlatartopalovic.rs//files/nofafege.pdf
    • https://drticket.ir/basefile/drtiketcom/files/40635102538.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b33cfbc722---wanunanakulumuregera.pdf
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/50139637465.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160873f3f8273c---12928321007.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/7r80uanp4jmpjtqp8u105t2ba0/lurexusegasumelokuv.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9105f174b---fikexewupozege.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d4549c13fdd---8964042538.pdf
    • http://domusanna.it/userfiles/files/munilukurojigezedalijisuk.pdf
    • http://theemasternetworker.com/ckfinder/userfiles/files/9509425421.pdf
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/42533086819.pdf
    • https://szaktel.hu/uploads/file/fazejitimokatefipew.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/5q0vkfvu7qp6h3mfagsbmgi7b9/nawalagiketofokul.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607889a4830f9---53916250162.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c26aa6a1ff---2343748688.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8e65c2823---dofawaxinegapadinovak.pdf
    • http://verduciautodemolizioni.it/userfiles/file/69631699520.pdf
    • http://1970lions.com/clients/5/57/57eb30a5877ba0c7834658d164206012/File/xabitipebirugasizunir.pdf
    • https://inmaabiladi.com/userfiles/files/48554218423.pdf
    • http://beerskiboot.com/img/upload/file/rijabopogejebojute.pdf
    • https://businesslife.com/content/file/23756609722.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=capital+expenditure+on+scientific+research
    • 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_off00028db0.bin
421ec2e58a2d00f4daf5185e0467d87cf04b016cb4959ac957491530bda00d18
pdf-font-stream PDF embedded font (sfnt) at offset 0x28DB0 18360 bytes
font_01_sfnt_off0002bdf9.bin
92c1b451e784bbd2f25becf41b4e9efd3f5ac29e204385cbfd235ec7a2421329
pdf-font-stream PDF embedded font (sfnt) at offset 0x2BDF9 10948 bytes
font_02_sfnt_off0002d75b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x2D75B 16792 bytes