Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6794db1e039c17b…

MALICIOUS

PDF

84.4 KB Created: 2021-09-10 16:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 47c4e08563b9cc7740703f99ab000df9 SHA-1: ee347e54c07bdedb9668791de82ff5b613cd3466 SHA-256: d6794db1e039c17b3a44b106b7458f96ba19fae1dc2b254b8dcb017e76887063
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was flagged by a malicious PDF classifier and ClamAV, indicating it is likely malicious. Heuristics identify it as a link farm hosted on compromised CMS uploads and disposable hosting, with numerous embedded URLs pointing to PDF files. While no scripts were extracted, the nature of the link farm suggests it is intended to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://ceskylakros.cz/userfiles/file/takekefugezofe.pdf In PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613afbc3f0463---dolupadexufo.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/24678010386.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136fcca7f4d3---19142345098.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bemevareri.pdfIn PDF document text
    • http://z500.si/files/28567487034.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/31184485192.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/41468711176.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/64032942542.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/37145975655.pdfIn PDF document text
    • http://bifruit.mk/ckfinder/userfiles/files/99385693167.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/wivikokese.pdfIn PDF document text
    • http://chemsdano.com/upload/files/41432537973.pdfIn PDF document text
    • http://furniture83.com/upload/files/73299229800.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/28988314006.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/89186118504.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210904003119.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/87455377948.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/sapugefogufoti.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132cb181af79---8996871349.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/97190953522.pdfIn PDF document text
    • https://onlinendttraining.com/files/vegalesipibazewara.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=vijay+tv+shows+freePDF 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_off0000e164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE164 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF976 19500 bytes
SHA-256: a8a792024897988d3109a96c0a81a57d9af06055a35be6670483a3789f4e7125
font_02_sfnt_off00012c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1E 10528 bytes
SHA-256: 3769b0eac5b500dcbcb08567078f78a0df068639693451927199e269e9dd3cad