Malicious PDF — malware analysis report

Static analysis result for SHA-256 df1a4fa60b2b8b39…

MALICIOUS

PDF

73.5 KB Created: 2021-09-19 00:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8ae0e1a057edbf43d010711f0ee21220 SHA-1: d036f7b786bb86729632334e4323f25a697859c1 SHA-256: df1a4fa60b2b8b39c97f913af05b9f4318526f6684ee137464dc53da156fcdf7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and a significant number of external URIs, many of which point to disposable hosting or compromised CMS uploads, forming a link farm. The embedded JavaScript likely facilitates the redirection or execution of further malicious content, contributing to the overall phishing or malware distribution goal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • 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 http://webinaris.net/ckfinder/userfiles/publics/files/moputojofimar.pdf In PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbbc796a2e---45135305934.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/meduveg.pdfIn PDF document text
    • http://cleaner.pl/userfiles/file/53660929853.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/nuluzutezigafujopigiwikor.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/saxuposonibubosemadik.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/jozanalujuwegor.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/27717750360.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/22317197635.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/80366853629.pdfIn PDF document text
    • http://premo.at/userfiles/file/fosamizatetagasanajagalu.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613649e65770c---bubusetiwibexuvezanu.pdfIn PDF document text
    • http://artediapharma.com/upload/files/botodalokatugigolid.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/rolanasoxonipan.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed79b5c21f---694662603.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/14ef327d702abbdf3efe23cc9533abfd/roxujudedemobemod.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/jupunuduxeloka.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/mabatodifi.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412b695679d---pusaxonawufabimowijuf.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/vapewonatemigiverujuzal.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/e9bcdc3c68c39c6d90f61e32aa3d9e5b/21249267472.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/sigipezatotekipimixax.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/77187788313.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/80216497874.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=update+play+store+new+versionPDF 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_off0000bd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A2 10656 bytes
SHA-256: ef3972a046fe8110bae7d345ade9da3e522dea013520b2d9f57b8f6e798c70da
font_02_sfnt_off0000ee3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3E 16572 bytes
SHA-256: d0b5e20bf785cf8f521cf4a0de1dace6b2719d1350d8735e6f070b46fbf1974c