Malicious PDF — malware analysis report

Static analysis result for SHA-256 3015fcce86dc48e5…

MALICIOUS

PDF

67.9 KB Created: 2021-09-19 11:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8ea4a370ea94f5f54ca7f8fe4a856b87 SHA-1: 34027e749f1cc33549c0ef3fa7f7e9cd185c2946 SHA-256: 3015fcce86dc48e54c547fa2faa1fe6fe8f9815630ddf4cad6d8d7232eb06f94
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including a small file size and a visual appearance suggesting a screenshot, designed to trick users into clicking embedded links. Multiple heuristics indicate the PDF functions as a link farm, directing users to various domains, some of which appear to be compromised WordPress sites. While no scripts were directly extracted, the PDF structure and heuristic firings strongly suggest it is intended to lead users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://naitikfashions.com/ckfinder/userfiles/files/88423244793.pdf In PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/vepukofetugove.pdfIn PDF document text
    • https://sambelteri.com/contents/files/wamazibuj.pdfIn PDF document text
    • https://support-trevianum.nl/userfiles/files/luwufu.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/45622396200.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/73123293294.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161452c5705735---77536715253.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/fiterunijenu.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/61c16e56bdb526f6a830cb7af7a8dafe/95618450132.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/85bf88b01d754cb86a38bebe4090ecb0/1304856248.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/48771522672.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/wobekufo.pdfIn PDF document text
    • https://shunnasato.com/72136736838.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d1664f994---48635527426.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/161395d0e4d7da---80901839012.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/52506596220.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/rewosi.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/27587871673.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/nupazubite.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/vagagajigixizufedovag.pdfIn PDF document text
    • http://askort.pl/Upload/file/gokiluxalan.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/fovigituxoduvumul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=download+rapelay+androidPDF 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_off0000af8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79D 14240 bytes
SHA-256: f0163cf98927718075fb209ee1befb70d759d90f3eec2a7120a9037c6afda815
font_02_sfnt_off0000eaf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF8 10320 bytes
SHA-256: 8927915b93dbb27eccd85eaf196983d10a3f76c46fa5745feab9f7109f260ba9

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