Malicious PDF — malware analysis report

Static analysis result for SHA-256 75be73eb0ea17ebf…

MALICIOUS

PDF

79.3 KB Created: 2021-09-25 07:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 30daea1d4a6eeadb0710b833b0931041 SHA-1: b18561fc4c2c00450e6ca64f6c99900220955c9d SHA-256: 75be73eb0ea17ebf0fa8f4391a8374719f18c4babca440ba42126d771df98119
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress upload directories or disposable hosting. The presence of these links suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

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 https://angkalaris.com/contents/files/87582296155.pdf In PDF document text
    • http://eichler-kammerer.de/81753952425.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac6ef0b16f---6700172115.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/83666285342.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16142c6ea94e51---82194830596.pdfIn PDF document text
    • http://rideco.hu/upload/file/mamegasumiravabuvulal.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/5564083443.pdfIn PDF document text
    • http://khonggianxua.samdigroup.vn/app/webroot/upload/files/zigigadimikobo.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/35036411204.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/52180181861.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0f98af624---1055654996.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/nuxikizam.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ced10b0e3---javolewo.pdfIn PDF document text
    • http://spbi.cz/res/file/99808814680.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/6770100381.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/3159953518.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132350ff34f8---25437289820.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/wivatamibufam.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/49377280261.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/sobonelofunevugameweteja.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/nesoxogawafavawixune.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210917153147.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/16273396125.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/xapejilekuvufubexedogi.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/relaw.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/44300496626.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=sending+cv+to+a+friend+emailPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E5 17784 bytes
SHA-256: ab9b290f97d2d6ff10a8cebcd0390cee6e2bf54a503f4c3650cdac09dfc9b83a
font_01_sfnt_off0000d0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EB 17920 bytes
SHA-256: becc2e80cec6e4aaca87dd6166c49590896c704eab7f225c279a412fef8f4681
font_02_sfnt_off0000fe94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE94 10792 bytes
SHA-256: 9a9e1060bbcf244826b9f0bc09178ca584d809606255484ef36484d44754bcf0
font_03_sfnt_off00011745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11745 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1