Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e4814a0986c8ded…

MALICIOUS

PDF

81.2 KB Created: 2021-09-12 13:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2257548b0a2351ca32a9b742378664b9 SHA-1: 8fe8b5465db890e03af6406f7bb88cb84ead1b88 SHA-256: 1e4814a0986c8deddca1eb33e16f21ee925439b1d624e58ca1d619cd5ffcbb0f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a phishing lure. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document attempts to trick the user into installing a browser extension or update. Multiple embedded URLs point to disposable hosting and compromised CMS uploads, suggesting a link farm designed to redirect users to malicious sites. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • 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://allytemp.ru/uplcv?utm_term=how+to+block+porn+websites+in+chrome PDF link annotation
    • http://jr.ac.th/ckfinder/userfiles/files/losewatujotunezer.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/dorabomigi.pdfIn PDF document text
    • https://angkalaris.com/contents/files/50044673365.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/29775930795.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/fuwufibaridewukonogitiwi.pdfIn PDF document text
    • http://countryclaim.cz/userfiles/file/19984663152.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130121e20bfe---43833443388.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109052027463249.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/rijoketifutijik.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/40831959148.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/5268066731.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/12572199552.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/90478097362.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/fidubovujute.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/99235398696.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/96035017598.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/29207109563.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/fawarimo.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133208c9211b---jonerurewitex.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/mabosogovemujowixowet.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/94030491190.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/92865905f5bd765f3bfbb71f57796e19/wunosaxewovuzututem.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/xamiji.pdfIn PDF document text
    • https://apra.pl/files/file/10800841839.pdfIn PDF document text
    • 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_off0000d835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD835 10788 bytes
SHA-256: 89c2d8696c6e37f061ca9855296847243b18abf98a37a5122f0590c97635fcf9
font_01_sfnt_off0000f0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BB 17884 bytes
SHA-256: 4a10f2b758b9e38b48d6683c184a659084f2948f65b60fb9f9fd2535ae471d14

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