Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2f89f4355d489e5…

MALICIOUS

PDF

75.3 KB Created: 2021-09-23 05:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1b7deab928e33873f18d3b68b3d2e363 SHA-1: 6bf5ead6729059038cd96a286f506d36e4437965 SHA-256: d2f89f4355d489e5f4404d42a87dfec6a5139af7b05bb68a642f6ba0716d81cc
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which point to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.lasallelille.com/admin/ckfinder/userfiles/files/36809154387.pdf In PDF document text
    • http://lnaixi.com/userfiles/file/20210912230524_129678172.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109221805143668.pdfIn PDF document text
    • http://wamer.org/userfiles/file/lebuxisugamunarofus.pdfIn PDF document text
    • https://gulamanis.com/contents/files/kasejulifuzelupuvililu.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/likimek.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210911174848.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210914_BA1869D9054EF518.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/5ebe0b831e2ff9065fad4d660d20a798/wedufofi.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/97807477218.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/22459233480.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/46d0589a2c066c329291d557c7fd1d82/dejisexixijipog.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/xuwagubulabuko.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/foruradobefajigafolafevep.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/19379195819.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161438ca4d9af2---vunefuxefagomonuvotakug.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/golalowoguna.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/xanekilonozijilat.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/19291628308.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/vugelavubakaxudivuwo.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/24332579838.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/13514542308.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/57692573130.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/gogaluwavofumejikelozifa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=evaluacion+del+desempe%C3%B1o+laboral+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_off0000c1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1BB 16916 bytes
SHA-256: 83fd208e54f791699f061ce9ab0de0a791e0752ab8c84818dc8d68832fa77745
font_01_sfnt_off0000ebe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE3 11180 bytes
SHA-256: 36942c62778f46bced88daf8d20a371f90a2f35e24e8bd3cfe9fb9d69226bfbd
font_02_sfnt_off0001057e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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