Malicious PDF — malware analysis report

Static analysis result for SHA-256 95a24791ffc7768a…

MALICIOUS

PDF

140.7 KB Created: 2021-07-20 19:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 021502da64028de6ae5b8b7f700d2441 SHA-1: b0a6f7b06f9d3b6d35f7bc31135f67f4a2826907 SHA-256: 95a24791ffc7768a3a81039dcf56a5fad272ae95b84270654bfa8604fbdb74fa
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which are identified as compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure itself is designed to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://akkoryazilim.com/userfiles/file/71111570273.pdf In PDF document text
    • https://bodegoncriollo.com/userfiles/file/vubopagozubox.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa1a698ea5---66731074094.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/31e4f588af266018bf2aa7ac7e010290/80169885055.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/31250810029.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/8944b06c4909cc64fdde6fa1fe314bb7/67229625287.pdfIn PDF document text
    • https://faprosid.com/file/fivazerefutexux.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bb61cb0a3---43700406781.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/cacce99151a3b67de6b7bb22fdd4a224/geretoxeluxe.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/f5csktaevio3ps31dmsmcla3pe/rijax.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d063d94a2---99188057615.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/buzusonuxajedowi.pdfIn PDF document text
    • https://dm288.com/slicice/file/laboj.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/886813d34483a9f5139b8c9411072c93/26540425001.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/44157557318.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a86cdc25a7b---32241612473.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/93065618114.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/36710164234.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16095fefbd72b9---29307426143.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/eeh18tq10lrroqpml4haph2lla/6414289442.pdfIn PDF document text
    • https://priscar.com/documents/files/burutirilizeponegupopusa.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c64abee622a---55753086059.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1625269935.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=functions+of+cpuPDF 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_off0001c77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C77F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001df96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF96 10112 bytes
SHA-256: 1d2ac47a18baa8fb45971f7b32bb09d2bceb84ef3c813c75849aad0f95b4306a
font_02_sfnt_off0001f63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F63F 17900 bytes
SHA-256: af1ae8370f8b5b877af551ca1eb71e75e6b654d01b7721c930c749a3ac25b72b

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