Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b02a95c977dbe48…

MALICIOUS

PDF

87.7 KB Created: 2021-07-31 10:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bad843d0da35d6714ce34fbba2bdd110 SHA-1: 27614d0b706ff72f4cedd5829ab7bb9f4a1c0099 SHA-256: 9b02a95c977dbe482f23f8315eda75542a08c1033c0abfd1905f76f278a646a0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress upload directories and disposable hosting. This indicates an attempt to lure users to external sites, likely for phishing or malware distribution. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://eortak.com/img/fck_temp/file/67391727413.pdf In PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606e0c5e1f617---50848222528.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7af8164dc6---23918107953.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e34139b5f---25568366479.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/wopusikonu.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/3b783dp0ffhpkih5v131v8sa7e/28921872329.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/85598642239.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160be4e068af96---64816961233.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/d9bae64c572fdf697ad1a834001fe296/lupuzomifomenozuvajo.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210718065402.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/77891073775.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/989c54383f63d10b1dc0e5152eea3593/28569233723.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/b7a74022ff16f33abb37c6fc5795727b/32682664152.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4f1e48f9a---kapef.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/jiripelelogax.pdfIn PDF document text
    • https://puppometalli.eu/file/70474766522.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/tuzasurunoxogamozasozo.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/k6am91d7obejbdmirq0rlum1e2/tewux.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/newupoxegavumobezobupon.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608327068f247---73711595815.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/29800898100.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/72622323236.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/17773483152.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f22c322c353---60694997972.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/mefodakirega.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/f0a15637881e31b699b8b615b5b5fd78/51718818309.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/nopumixova.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+stop+a+motion+sensor+light+from+turning+onPDF 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_off0000f455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF455 16712 bytes
SHA-256: b7d97531adec638b24a86d14e755ca8587458760fbf601df7b672e5d8fb6fdb2
font_01_sfnt_off00011f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13790 10980 bytes
SHA-256: f3923940cd4c664f838b97d574c8337ebd75a6b1d39080fc1dae83e024325053