Malicious PDF — malware analysis report

Static analysis result for SHA-256 e765c4c404491c68…

MALICIOUS

PDF

75.1 KB Created: 2021-10-20 20:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4238d4dd8e56b4f1504019f4f2d12a0e SHA-1: ece0bee690a21208fe036588de6982c72e67c2b2 SHA-256: e765c4c404491c68e3b821094dcd2503b0b2bcfff4a57949b56805ecf5fc40f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress uploads and disposable domains. These links are likely intended to lure users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://trendstyleimage.com/uploads/ckfinder/userfiles/files/41737401959.pdf In PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/23909000314.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/73322520344.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/94906859381.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363db6785b9---mupaneril.pdfIn PDF document text
    • http://palami.by/images/file/81110346964.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/548f17818934f50c8b9f6ad571b4c15e/25038994324.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16134900117467---35311337757.pdfIn PDF document text
    • http://parentini.it/userfiles/files/tufuzojitoj.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/13546493854.pdfIn PDF document text
    • http://theblare.com/image/upload/file/95317774724.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/14803596565.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/makozurude.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/56749878229.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/sevolovorelafujobe.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/31718691463.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/kubezi.pdfIn PDF document text
    • http://centronegozi.com/public/buzumifomisipo.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/fegosojafanafi.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16159386a18720---vukujavazel.pdfIn PDF document text
    • https://avistravel.activsport.ro/userfiles/file/61018166156.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/51814119431.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/94522118922.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/v0h7p3omj134k1vj1lqdg9hr74/pubiwoxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/1hHberoKktI/uplcv?utm_term=ascites+in+young+femalePDF 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_off0000c2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F2 16728 bytes
SHA-256: 9836e5beabbdcc81692c4926b1cff08e3586fbcb68d5a6a548da784f2a58557e
font_01_sfnt_off0000ee46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001065d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065D 10772 bytes
SHA-256: 5b6d11edf58587f18f006ce288a80d8809f88914b371354237ee4a55f7b3465c