Malicious PDF — malware analysis report

Static analysis result for SHA-256 070b44fb2dae9be3…

MALICIOUS

PDF

78.3 KB Created: 2021-09-22 20:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ec0a9fba9c713710654b42edf9668dd0 SHA-1: 21fe826a5d83b5744ecf4eb6210f0b01baa5b386 SHA-256: 070b44fb2dae9be38c6ae244ff58654e6bd789796c51ced22e2e13e8880457e3
196 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a ML classifier and ClamAV, indicating malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document attempts social engineering to trick the user into installing a malicious browser extension or update. The presence of numerous URLs, many hosted on compromised CMS platforms or disposable domains, further supports a phishing or malware distribution scheme. No scripts were extracted, but the overall pattern points to a phishing lure designed to lead to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://dinskayarealty.ru/media/file/24686874879.pdf In PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/zibap.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/joluvami.pdfIn PDF document text
    • http://deltools.com/userfiles/file/48934847407.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/83571119138.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/98783812694.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/16899b866da8bff9bb0c3090ded972ff/gowimopifafazadok.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/pegulaxakumurisetofivo.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16138d0edda6da---rufaponufame.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/43237251287.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/rukubojidalimonafilebege.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/nawudexuwinumupexuvuru.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161314fe16b046---sanobe.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109160747461199.pdfIn PDF document text
    • https://sambelteri.com/contents/files/50638958512.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3a3a9f6ba---28877936640.pdfIn PDF document text
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/28607393778.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/tubefogowarif.pdfIn PDF document text
    • http://gorillatheory.com/admin/upload/file/rilarujopivegoguridisufow.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/94430995795.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/vinorixatekuwaxigadute.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/55568206434.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/sidetujerezezetokela.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/64cjgd696samd72vsgtk70ml20/vugefarujabal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=similar+apps+like+snaptubePDF 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_off0000cd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55B 17476 bytes
SHA-256: 8b9d1380951a9d0d52a3aed44bc45eee05e8d3361842e46a89f92d57ee39e513
font_02_sfnt_off00011309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11309 10700 bytes
SHA-256: e6b009491fc176da36e25954a312a3d36a52260bdbbba89a7d5c2fc3159f7be7

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