Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0d8f6bd1a117cb6…

MALICIOUS

PDF

100.3 KB Created: 2021-07-16 04:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 6fe2911ab73e8d8e250f168af11ffabc SHA-1: 5f56c5fae1624f153f0d15cc72ed8f11e3c5fe72 SHA-256: a0d8f6bd1a117cb6cd741dfe2e2d01a6988be64dc4a95d1c8bf350a0243b9a73
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised WordPress installations or disposable domains. The presence of numerous URLs suggests an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

Heuristics 6

  • 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.
  • 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 https://queure.ru/uplcv?utm_term=towns+in+cape+town PDF link annotation
    • http://bet-balance.com/userfiles/file/mevulini.pdfIn PDF document text
    • http://saydersan.com/firma/files/zosedinefawope.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/73222814687.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/93986764613.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928d30260f8---63323300093.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/ginofitipixubemi.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/29963394456.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/301f72b66c26007545fd5f94b9abc905/53312440816.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/fafori.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/gasuduwipumekakumaxanagek.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/wutixosasuliduvugomubefo.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/5i3u9b0pkn7nt11ms145606iec/88232470246.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/89eee598a021258d96bcbe30dab1a8e5/lotilu.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210627_719202CB246F05B1.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/bubulako.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///57812539625.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/bea37e4120d996081a53cf680cbdab97/66985811830.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/45688365002.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/72434433909.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/88645141133.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/4add17e1b6fd5bec828f542f2bef318b/53314543642.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c3bee0722---13323526825.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/19275165711.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/84621248392.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/73540732482.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/78023786690.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/vuzewipurafezo.pdfIn PDF document text
    • 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_off0001277f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F91 17252 bytes
SHA-256: d7be2c5452c76549af36d8ac19ef261a3996ffb20639473df0afeb7c27e708e3
font_02_sfnt_off00016c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C8E 10268 bytes
SHA-256: 9c648190b53e9b4521239e904edd8ec1cd6c6bd6bbd21e262de29d2e35f60e68

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