Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf0b9c5f578c23b9…

MALICIOUS

PDF

81.0 KB Created: 2021-09-01 22:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0d8675b254cfccc77d5d8ec15ca5f0ec SHA-1: c0c49f4510613d7e040e37995e3eb676fef66407 SHA-256: bf0b9c5f578c23b9b5bc2bbe491c9a533838b304d6675db61a202d70c0712105
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript indicates an attempt to execute code, likely to redirect the user to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610715168d18d---94628715824.pdf In PDF document text
    • https://bcbc3399.com/upload/files/buvamurezisewotusafami.pdfIn PDF document text
    • https://saam.vn/images/content/file/xubawid.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/vakajinakuvuboritogutowik.pdfIn PDF document text
    • http://k1a.ru/images/files/file/68041359281.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/zetatajivoruvikodezon.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/xiwalevimadeliwitewozamuk.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/gifaroweji.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/rogakipuragumomejuzaxidu.pdfIn PDF document text
    • http://aviafond.ru/userfiles/file/89061747771.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/63119542017.pdfIn PDF document text
    • http://one9five.com/userfiles/files/gasorukebo.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/b3e233eaf87bf85b10e18f1c87877f02/kamezawefinofanut.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/0742ce9aa8bf51bd2f649d75fcd16fd6/38336579653.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/jbh74uoqtuelk9p3otvsnet6o9/xiwadunawum.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edba2d53469---68225138759.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/40a77feb29c87b900a3aace9f72e3b29/xotet.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/79300653892.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/vikuwumutajin.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1280de0e0---nowajeperimoge.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/6268740106.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/0b264e95857cf3a3b3ad6e6044dedcc4/33748928446.pdfIn PDF document text
    • http://arablift.net/userfiles/file/vunutobipididerodeguzoro.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fc3e4e2d14b---67302221873.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=protocols+and+standards+in+data+communicationPDF 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_off0000db5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5F 16596 bytes
SHA-256: df9352e5982220a6f6ae37f2ffbaecc28612a6b2a7c6f733fa1c33e486e1ee47
font_01_sfnt_off000105fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FB 10500 bytes
SHA-256: 7f1afa31dd484aef3456c5a9aaa766bf6258d87c7626280a9913baefdfcd8197
font_02_sfnt_off00011dd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1