Malicious PDF — malware analysis report

Static analysis result for SHA-256 de142746b7a5916e…

MALICIOUS

PDF

89.7 KB Created: 2021-07-06 05:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8359f6682da2ee92efff9a32731bee00 SHA-1: a6cd90098a5b2d77e104366f68cd89f3767cde6e SHA-256: de142746b7a5916e2e4f885b0087ee322d3b7440f61137d9271fc350b9d586cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The primary purpose appears to be phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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://robertsrucker.com/clients/7/7f/7f5ecd1287ec2152c36a7dc1808edcbf/File/rewetipizopob.pdf In PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080e108a2302---xawoz.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7b3646082---xuguwi.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/71350800078.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/ruwujefuga.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/lotixometoxo.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/doremufavezitigoka.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/kofonigomatajar.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817b3a69ccd---99627858601.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/zejadaneluram.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/22868559656.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/guloluxeduwumavaxine.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/eavfotic1hsitf98cu66mjnsd2/1754066579.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80fbfbd78c---tujesetewomilaru.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a7769d665---pafezezemofatojalisoreto.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607759d806afd---zinefosolexovulifa.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/b896768c7b3df8776cfe700da2299b04/bisejaruverapa.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/67567332124.pdfIn PDF document text
    • http://llux.vn/uploads/files/25899473917.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b096e9041a0---magevuziti.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16075d43750a1a---74400521060.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/43744205759.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/kamate.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/7150594496.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+make+a+love+song+for+your+girlfriendPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D5 17904 bytes
SHA-256: d2c9cdd5662fcb59ed7e822b067c3f9273016f25b6cd6d662ab9ced2ead83f79
font_01_sfnt_off00012576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12576 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D8D 11144 bytes
SHA-256: 0f627ca7f1ec2c8a6f10c8ea03bc4f4b680fee015106710b463138a0490a19a9

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