Malicious PDF — malware analysis report

Static analysis result for SHA-256 d628b00d7c20372e…

MALICIOUS

PDF

76.7 KB Created: 2021-09-18 05:14:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2a5b3493f30711c3434fef7cb909bc45 SHA-1: 9b1df3fc64c3651e52a38f6187067c65201fa7e1 SHA-256: d628b00d7c20372e5f1e580f42e04b16d06d86b868dd885721c3996b0449ac10
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan-like nature. The document functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress installations. The primary goal appears to be directing users to potentially malicious or deceptive content through these links.

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 https://bliznacite.dvsportbg.com/files/pufazizewereluruxax.pdf In PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/00ba2c9b766e10b49db95c7ca2478948/45482565146.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/vctdhhtf0vorjl4dovok8fp82g/5121465733.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/fazutu.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/52444486058.pdfIn PDF document text
    • http://susutour.com/userfile/file/fomutunuvukajik.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210916001004.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/jimizogorobukifuraleletiz.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb3e51b9f9---tesiwodolisivonavetena.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/tapazudebu.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/kedajinugut.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/jobep.pdfIn PDF document text
    • http://saaretravel.ee/images/file/78836882789.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/norepupasopikez.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/94855110042.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/jiruvefetajugurerere.pdfIn PDF document text
    • https://gryf-wet.pl/ckfinder/userfiles/files/fowazupixenu.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/54354101065.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/desopuzigozutis.pdfIn PDF document text
    • https://claudiodituri.it/uploads/galizibivexufiv.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/88422930562.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/ditosozafugorapigoxozubog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=best+free+ig+followers+appPDF 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_off0000c98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A2 10568 bytes
SHA-256: f372a0e6a831ab9b355a8693281fbb673f473a5d4ba0b1cf24e745ad381d4b1c
font_02_sfnt_off0000f9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FD 16812 bytes
SHA-256: 96727d2402dc35a6cecc5e48ede10d44a5b9bbb6ec0d6d41657403914b6f6275