Malicious PDF — malware analysis report

Static analysis result for SHA-256 11eeeafa1588a1ef…

MALICIOUS

PDF

82.5 KB Created: 2021-09-01 23:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4589a3c6324b4b96640027bae8db6f5f SHA-1: 43fad0fa5fe6360ab33a210c5fcd5c281d2ba1ed SHA-256: 11eeeafa1588a1effcd0df4fed1f917837d39512456eb3961b523f6b0c7103dc
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or redirection scheme. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing lure or a downloader for further malicious content. No scripts were extracted, limiting the analysis of specific execution methods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dee3ead82e---gimufofurofuxanonozomebu.pdf In PDF document text
    • https://onwater.my/uploads/file/76839313294.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210710_6AC54D086A9E3369.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/h16f74t1embqc88m50p3mftpn1/kizolibal.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/tivofagumotemojotam.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a511321a835---nimetagoweso.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/92846978238.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607af070750b3---34725752034.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fa050c15c0---8557630849.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/92738501312.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/kuvewizimewatizol.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/79514273884.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/pifekinulifobaxowejosove.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/19638322985.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/nojenuf.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/pixomutijubixiteji.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/92344373007.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5a20d4e89---59776136475.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/tagegevejujemoj.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e53f4ccd17---45086902435.pdfIn PDF document text
    • https://sanidom.pl/img/file/55208928217.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=birthday+prayer+for+your+sisterPDF 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_off0000dad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD3 18272 bytes
SHA-256: 3e46ce96997efcc409954d22fa2113b036b55a9ff600185faa40435fe52cf1f5
font_01_sfnt_off00010966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10966 10712 bytes
SHA-256: 27721390f7b721c9d2390ecf29d79e002017bad699547dd31d584f39d59f2f91
font_02_sfnt_off00012234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12234 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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