Malicious PDF — malware analysis report

Static analysis result for SHA-256 84aada3630aad524…

MALICIOUS

PDF

87.2 KB Created: 2021-09-19 21:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3b9f4cd6492a7d72cf309aed5b83d835 SHA-1: 3826c6351857b863475dd5d824a0574c0765a2ec SHA-256: 84aada3630aad524c8b9f4b2a7dde207b0b6586c2a0d4892c00621b19535d601
196 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing and social engineering attack. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document prompts the user to install a browser extension or update, a common tactic to deliver malware or steal credentials. The embedded URLs and link farm heuristics suggest the document is designed to redirect users to potentially compromised websites, likely to host the malicious payload or further phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://oniceh.ru/uplcv?utm_term=putlocker+movies+2014 PDF link annotation
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/80996663053.pdfIn PDF document text
    • http://benrassam.com/uploads/files/41699344841.pdfIn PDF document text
    • http://grupophi.es/uploads/files/42524882738.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/sapepot.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/161467c5a173ce---banunajixulimewipipigux.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb3aeab1e3---vuvanija.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/96265120559.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/29607773579.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16132954f2fa38---lukomotekixepikasowuzol.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/zigojiduwigezubomej.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/repovusosobuvezi.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/manuxamoz.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/5427006199.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/reberafilezagifan.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/75252858854.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/jezozumiviwexis.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/rafonewuzumigupuzidomig.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/m3vmn3660h1fihifvbsshu53e3/vugilinufuwidovasop.pdfIn PDF document text
    • https://yodobashi-church.com/53165766642.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/lojazofepepuk.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/retopame.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_off0000eb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10344 10756 bytes
SHA-256: b39470a51fc719e364197f48fffbe818dcecaf8482c8d4eed72b6fb6b206c73d
font_02_sfnt_off00011c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3A 19796 bytes
SHA-256: 03092c872e126b6d0dd079265e65f44fd8ac3e5e0aaad7df6c3465eaae4b19aa

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