Malicious PDF — malware analysis report

Static analysis result for SHA-256 a005fff1d92b33fb…

MALICIOUS

PDF

80.9 KB Created: 2021-08-14 06:20:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d979f58ef69ed124cf10c18b348cb44e SHA-1: 1472d7f7a898c14495b35abf8753042eeb9fff0c SHA-256: a005fff1d92b33fbd067d5ce3c340b2a5eabd275cf2a2dbced7ed2371290a78e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs pointing to compromised websites, many of which are hosted on disposable domains or utilize CMS upload vulnerabilities. The primary attack pattern appears to be directing users to these compromised sites, likely for phishing or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/ce34ouu33198pq007ic4lfl756/20821718518.pdf In PDF document text
    • https://aprilboya.com/userfiles/file/jopokavaginisagozigidi.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/minolinufuleginedonagom.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/483b387d91c740941532d6aabd3e8341/vaxibuxidununimimipugef.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/b147c9f1bd816429ea659c6bc5427643/dozejiramubedaweriferekan.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/nm09pc57mm5k71cuk4irqgd0n6/pagetazojisefumojovusaji.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/gozogigobawebotukusasa.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/pozuzatelexopulo.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/84367870485.pdfIn PDF document text
    • http://ahchala.com/img/file/rigivax.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e761b5dfe0---30196844327.pdfIn PDF document text
    • http://viajesalaos.com/webroot/img/files/86171742395.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/56279177949.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2641352a7---famufolizetixuxi.pdfPDF link annotation
    • https://terminarz.online/kosmetyczka/krakow/files/96309167491.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094649d67578---wixajagiregudutexomeme.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e014f9af78---91051987301.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/63961951513.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/67855911861.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/17750625459.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/xobulevogiworiroborasuv.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/c67c1e1b456702c01f2d8d35237d74e8/80588830050.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/24988114217.pdfIn PDF document text
    • http://rayzerfamilyreunion.com/clients/0/08/08e2d5bcffca37c2e1a82d364f4296c6/File/nezewisemopesuxinol.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/2147474957.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=product+cost+calculation+sheetPDF 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_off0000db29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB29 10568 bytes
SHA-256: b7ff3c7dca2e2f156cd215fd7a2967f2d362f2bf852926ba9cc07bbaf6d4ba30
font_01_sfnt_off0000f32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32C 16364 bytes
SHA-256: cc3ef9be59d1129afe9cce20b6a0a90e366322fa89caaaf0dfbf493990396a31
font_02_sfnt_off00011d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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