Malicious PDF — malware analysis report

Static analysis result for SHA-256 7611fbeada4a2ed0…

MALICIOUS

PDF

78.7 KB Created: 2021-09-11 01:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b727ca6c170504fcdda126040291dcfe SHA-1: c7ebaf70974493aa64115785f91bbfc82d4bce6f SHA-256: 7611fbeada4a2ed0120c6483fad3b20a44c9fb1f731deb8e8dd800836a547747
196 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress uploads and disposable hosting. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document's purpose is to trick the user into installing malicious browser extensions or updates, a common method for credential theft or further malware deployment.

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://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/zelax.pdf In PDF document text
    • http://riviera.az/userfiles/file/zijezozurepuzital.pdfIn PDF document text
    • http://cutskytools.com/d/files/50521734600.pdfIn PDF document text
    • http://esistore.de/userfiles/file/sofugejazavugilakuxobovaj.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/99346890722.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/86617789582.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/rifuserezarajisa.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/29786445846.pdfIn PDF document text
    • https://12shio2.com/contents/files/18620853908.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131aee3914fa---romusarojipoduwovesisuli.pdfIn PDF document text
    • http://jfe.hk/userfiles/toruduwiwijikatoxulisofe.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/69958918922.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/90146230090.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/15521311992.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/6it9eujephqjcla30ncr0l5il7/48489524024.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/7829819586.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613269b4e4046---60163643411.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71968957159.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/5852981052.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210909075121.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/jezetu.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202199203633404.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c10726e04---fuzejavesipifeli.pdfIn PDF document text
    • https://mrpressconsulting.com/UserFiles/file/52454420741.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/31512804716.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=email+for+cv+attachmentPDF 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_off0000cdba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBA 18868 bytes
SHA-256: 3a67818650ca83629f965361ff8ca274caae6fdad783487d3014bf5a6cdad472
font_01_sfnt_off0000fda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BC 10484 bytes
SHA-256: 4cca2ec3941f665b1d239943e42a7cec711c152117b9de2871f4982a4e961e62

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