Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd843b9eafada47d…

MALICIOUS

PDF

86.7 KB Created: 2021-08-14 03:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 89d4b2038974cab58d0ab3cb74f1f6a7 SHA-1: 136bb02761019b95e7204822a6ebcb69f80d3717 SHA-256: bd843b9eafada47de7de4a59d55cc89ee34442e0697b2637354176f04dd566db
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=black+and+decker+grass+hog+xp+gh1000+manual+pdf PDF link annotation
    • http://patp1ryb.ru/media/file/8313173056.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/hqieqh426ahfaf9nu0eenpjtto/wowezepesafomamudodami.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/fujevuja.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd8df615b6---49000848741.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832969af8a7---pogofituled.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aed4a4cd7b5---93808673975.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/t6j4bd634qifso4hl791ls41nk/memutepagidupafetejoriso.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/63675840256.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/15524951899.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/6af8e0c73bccecc26983735e0dbf4183/rubak.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/larekowajagebazuz.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/ude22ccr4psgh1v26jq36hrtjf/refajovejupijenil.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/bapemumilemen.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c73fa17d5---57309861706.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/n08lmlm5g2qcp6ntinovmnc6vi/43778555698.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021042913582673499.pdfIn PDF document text
    • https://digicpictures.com/downloads/75480811232.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/temexiwakaferuwi.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/zewugalalidijibu.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/pekedif.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16113131d12b7b---pitolilafimedekix.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_off0000ebef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEF 17548 bytes
SHA-256: 201e14e83c12e296a033436aa33cb55a4c32844fe28128e27f7b8d3ba820ebdd
font_01_sfnt_off00011a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A53 11400 bytes
SHA-256: a6828cf18b246b2e1ec2f887ceef12066615da33f25577b8e41dc6a5fd80e7de
font_02_sfnt_off000134e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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