Malicious PDF — malware analysis report

Static analysis result for SHA-256 783bf2c081facdda…

MALICIOUS

PDF

99.6 KB Created: 2021-09-05 04:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c0f95a8b1545dcb313b68d912b994954 SHA-1: 47741f199f48c519c57a28489487d59c4a5c8f8e SHA-256: 783bf2c081facdda7a7ef221ad57907894c8e0bc3637f3edcd40f9fe52ad4cba
156 Risk Score

Malware Insights

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

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, with numerous embedded URLs pointing to compromised WordPress sites. These sites host further PDF files, suggesting a multi-stage download or redirection scheme. The primary attack pattern involves luring users to these compromised sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160720edfa53ca---limufolaxufasesazujozezu.pdf In PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/8aef518969dda0734b5d66b470bfaeb4/14060333974.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/5b650664e271e57d18c2bebf40e00afd/luvusu.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c095f65745c---13721639604.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b29df58251---texeketowikobinaw.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/4c7b2311b36bb5116acbcca97bf7c976/63564112966.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f09563934a---99766779239.pdfIn PDF document text
    • http://1976ahhs.com/clients/32223/File/84098060001.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/38438518199.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/zaxipunululave.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/19ddf6309eb4648a6a22def74eb3c10a/kolotoduvukakotewegama.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/438c40b4fb0232315476e4c53f013c99/zirurezezuwevewupideloxef.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202108141037075988.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/8497468730.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/7k8iu3c550p66oi1bnn3vk6e59/5458990972.pdfIn PDF document text
    • http://hzdshg.com/images/upload/File/naveroj.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/rapuvesukuxetirapojidawe.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/67578372579.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/6b4912175af822a28b401fc9222ed3c0/zejokivos.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160d7449584a4a---vipez.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/5207268501.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/sphedjtfnvdltgnt8vfu6b5rdp/pilifujazezizasonus.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607809575f94f---fowegunudilurixawiramugod.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/vazisobitajivenuwoxoporaz.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caddf2605d9---zamalarivi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=fichas+tercero+primaria+ingles+pdfPDF 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_off00011b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001331e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1331E 11044 bytes
SHA-256: 8f51d2464af25a06ca0eb0a05d746f4fa48d053bc75620819f171b1b1c0bb635
font_02_sfnt_off00014c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C66 20580 bytes
SHA-256: fb50d4e8b2117ccff947192b2a2308a94585cc0f250fcdadc464c7b1222d9852