Malicious PDF — malware analysis report

Static analysis result for SHA-256 647bc2bba56d8e70…

MALICIOUS

PDF

82.8 KB Created: 2021-08-19 14:14:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9ee276c36535fb867ad0c1c579c77a6e SHA-1: 509db7b889187419d162429de45489473f14b0bc SHA-256: 647bc2bba56d8e70b4c167c7c7c3904ac6e25c68a62e48cac3f24f858d9dcd69
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs pointing to link farms hosted on disposable or compromised domains. These links are designed to trick users into downloading further malicious content, as indicated by the ClamAV detection and ML classifier flagging it as a phishing trojan. The primary attack pattern involves social engineering to facilitate the download of a second-stage payload.

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://drafthe.ru/uplcv?utm_term=designing+with+the+mind+in+mind+free+pdf+download PDF link annotation
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/1c61c5656ce7033fd28d4945468a458c/49803823424.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/razameloxenerij.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles//file/gijewubulefedubukoxel.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/23618976080.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8528f2456---31549997733.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072803e6fcf4---xamudikadogaj.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/woginixoru.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/23335148657.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/zonuvigetiditogumebima.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/52345924511.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/3e0efcf37502ba0dd171dd735547bcf4/xofimogelikilu.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/pu5a2jtrvas9sf3btmlrc1v8c1/bolesatinil.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/neturolivufadebevagovojok.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105122103.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f17988a4d5---rewenoni.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/95509472214.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/24dcb5bfd8df8f25983c80e7fd7217f7/sokuteluvog.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16088eafa3a775---48613389854.pdfIn PDF document text
    • http://wardwrightself.com/clients/863644/File/famazune.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/fozimepiponumisak.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d66a5c417f---kakixo.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/1bae52bd144b36342fc281dd11601d44/depozitadafozig.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/97521237302.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210725052019.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072bdf5def13---32998332505.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_off0000dee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE2 16500 bytes
SHA-256: d9ca800beac89d5aedb4b3b94ca52d0af73222bab3ff275b31699afaf3dc08ff
font_01_sfnt_off00010983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10983 11032 bytes
SHA-256: 025458703da0c66553703445418b809e0dc2dd4f543d23fb181e3db640e4cbe4
font_02_sfnt_off000122d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1