Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8d710899914f7a…

MALICIOUS

PDF

84.7 KB Created: 2021-09-11 10:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7a02ff878db7f7b9dc507dd91b08406d SHA-1: 9dddfa7ec38ba1b3e3fdcd14cb2ec551faac2025 SHA-256: 4d8d710899914f7a046f2b44b87f7b8712689cdee10a0939e385d2f94fed4319
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and a link farm indicates an attempt to lead the user to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://driftwoodcc.com/userfiles/files/368166393.pdf In PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133dada871e0---14032993453.pdfIn PDF document text
    • https://tarsiman.ee/files/file/romugaromowogotezitoseg.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090211022476998.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/9568b70f3d8dda09937652c106f26dcb/gerabupezozuvavefibevafog.pdfIn PDF document text
    • https://questyme.com/userfiles/file/85084512354.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/44241566895.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/rafaligewikoviwomijabo.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/solebek.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be69762c5b---mobixegasufoputixosel.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/45546519602.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/69996604728.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/55307846001.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/datureruzugol.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/88590042184.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/nunazuvi.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/7861211502.pdfIn PDF document text
    • https://heyratacademy.ir/file/kumos.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/tumonexekajemu.pdfIn PDF document text
    • http://gachmenminhchien.com/media/ftp/file/86350621648.pdfIn PDF document text
    • http://glttek.com/userfiles/file/70054470965.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/9056052125.pdfIn PDF document text
    • http://moristas.com/userfiles/files/51947667784.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/49677546085.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=mass+effect+phone+gamePDF 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_off0000e3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B8 19104 bytes
SHA-256: d01fb1e71f4f715fcae3a16b04d18a7b619c8bb63269060862470217d17b3b2c
font_01_sfnt_off000114e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E1 10680 bytes
SHA-256: 275a4ebaf4f3bf4d3349f01aed8c11693df50d5d109066751d21627dc52e9150
font_02_sfnt_off00012d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1