Malicious PDF — malware analysis report

Static analysis result for SHA-256 908e07d25f7817b2…

MALICIOUS

PDF

81.0 KB Created: 2021-09-16 22:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ba057587d0c1cf09c14349e3680f7f46 SHA-1: 30a6348f70f4feb2dec706ac95a9c564b543aa88 SHA-256: 908e07d25f7817b268365c6443d701977a2848c52fddfe9f502ca0624e28a27d
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document employs social engineering tactics, including urgency lures and a browser extension installation lure, to trick the user into executing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to facilitate credential theft or malware installation. The document contains numerous links to potentially compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/28766886713.pdf In PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/41514135396.pdfIn PDF document text
    • https://cuatudongnhatrang.com/uploads/files/88609246771.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/rabibudesosimezilaf.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139ed6230e3c---63571277946.pdfIn PDF document text
    • http://suurelepa.ee/data/file/8877913435.pdfIn PDF document text
    • http://cpils.com/userfiles/file/kozaziwuvanodowalo.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/zizifa.pdfIn PDF document text
    • http://www.culturehousesun.org/photos/file/71323856624.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-4/20210904151506209808.pdfIn PDF document text
    • http://erictex.com/ufiles/files/58018443678.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/sikabowozazimoredibojej.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/zidumawuxetadu.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ce93c7a2c---20135469537.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/regod.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140426fc2b88---zakodubaxenexunuxodusajer.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/zerofuvotuvotumuzanuzubo.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/jefatoko.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/fotijafelejilijexom.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/zubokewedogow.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/161316632dc633---vedapozuse.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ojiqu2nh93naieg96h5ugfai97/tidikig.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/16395295918.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=convert+webm+to+m4aPDF 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_off0000d782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD782 10364 bytes
SHA-256: 1b77c72912fbff6446cad1b32a6f00bbb3ba6ba685edaeac48d65cdefd767f62
font_01_sfnt_off0000ef12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10724 18072 bytes
SHA-256: 73a97da95081a52689fc51d0101c9637edbb024357962810e71cfb1b9c7b369a

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