Malicious PDF — malware analysis report

Static analysis result for SHA-256 23d88916cc333bd1…

MALICIOUS

PDF

71.6 KB Created: 2021-09-06 11:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: bc02f8e5913c5382de5235040c3b6a22 SHA-1: bb1a0756c0cc1a6f7e8287899f733cc41ccd1ca7 SHA-256: 23d88916cc333bd11969fd7edd6205c8ee2dfb2564ea76fbf59e3ec4e8a8b520
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external PDFs hosted on compromised WordPress sites and disposable domains, suggesting an attempt to redirect users to download further malicious content. The presence of multiple PDF_URI and PDF_RANDOM_URL_LINK heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://kfnmdg.com/upfolder/e/files/20210619065822.pdf In PDF document text
    • https://doluhosting.com/calisma2/files/uploads/nitosozivivodepige.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/35144379749.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/burijoga.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f39bb5658d---58506959964.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/vefexekerofaf.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/83dba625ef11d299a8f2b369e3fc1ad3/wotudukewilidefijowozi.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/e024964f37ca39c64954be44010ef4c7/kexoretefuvipizagomororo.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/ratufomokaginemesu.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/41425137944.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/18670639125.pdfIn PDF document text
    • http://traviet36.com/upload/files/76499463944.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ea1b03048---16292359047.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/rupuxalixade.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/60389626209.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/4ik4lpa47ogkn71btios246e66/bikedonigotidozexavinito.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072de2eba7dc---vexeribupefibow.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/fujoladidijege.pdfIn PDF document text
    • https://bataretak.com/img/files/file/92654018111.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/72423342707.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=scientific+inquiry+pogil+pdfPDF 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_off0000b611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB611 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE23 16412 bytes
SHA-256: 41dbb116fe45d15aa33d780fa98b474d7512920aeff979af0166d2980444bd03
font_02_sfnt_off0000f86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86F 10900 bytes
SHA-256: b563fd83ca12539bff9f65fcce46fb43ab5e2c9fd17bd3a0655616218da64ca4

Open this report in the interactive analyzer, or submit your own file for analysis.