Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8e0dcf986cad689…

MALICIOUS

PDF

83.4 KB Created: 2021-08-17 06:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 979ffa5844f534414794de16deef31b7 SHA-1: 7ef5319f51978d5c6dc794dc59f242185ef88472 SHA-256: b8e0dcf986cad68901e61495e98b4f382d06b70f85211102a26a2186b7fe6966
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It functions as a link farm, containing numerous URLs that point to compromised or disposable hosting, likely intended to redirect users to malicious content or further stages of an attack. The ML_NYX_PDF_MALICIOUS heuristic and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/14362871767.pdf In PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d75985ba7a---napalenu.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/pipigegogamudetid.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/0d309522ca924bba5a0603c77e16bdd5/13364590579.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/30950425550.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/dimijobokifupawarixa.pdfIn PDF document text
    • https://nadinerogger.ch/userfiles/files/84968073525.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1cf19784ac---fefivetakemolin.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/eklk6u65banaen4qcueoiq4uj3/73045413395.pdfIn PDF document text
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/27944361889.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/66004277800.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/tidafunixonagibokik.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/g18hnt6ra8t859150qt4kbg2n4/94398589905.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6620b47684---luxowojobexebutavo.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/gijarunodawo.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/61945972397.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/ac43799c66201867aef050cc84bb4544/ragomimadanesam.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/4b940b681cef245572ff3611fa06e8ab/jejusobefiwewufukemila.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/nekexuxotug.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/4d7fc7d028a2fc443593b948f51c4bdb/bojawifupovu.pdfIn PDF document text
    • http://jaatkinson.com/userimages/40283126735.pdfIn PDF document text
    • http://hebertfamilyreunion.com/clients/3/32/3272330ca4c68e8b1120eb7f178c7a05/File/tiwumigabixogozugiw.pdfIn PDF document text
    • http://iltorg.ru/upload/file/tiwawizekufukewazem.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/dojunisuwenidage.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/radujefupozopabikuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=10+oraciones+con+sujetos+y+predicadosPDF 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_off0000e1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A2 10884 bytes
SHA-256: cc85db674600cb071badd95435d10ed2701e893cf9a1fe716abdaa7639c285e6
font_01_sfnt_off0000fae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE0 16620 bytes
SHA-256: 06662f691f94927d2271c6f2bd05ca21c2f03be5d5bd1b92a8effdf7819e0b23
font_02_sfnt_off000124c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1