Malicious PDF — malware analysis report

Static analysis result for SHA-256 092baf7c05268786…

MALICIOUS

PDF

84.6 KB Created: 2021-07-20 08:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 988691aaec37612f5135e6530eb98715 SHA-1: a07c5842d737b557b68980569e31867ae9f710d5 SHA-256: 092baf7c05268786c9bf08bf2a92ea1881371cc068ad5e702d54270be9bb5428
154 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress uploads and other disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it exploits a vulnerability to redirect users, likely to a phishing page or to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8203

Heuristics 5

  • 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
  • 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://taiwanglassgroup.cn/userfiles/file/gapodopuzugikeluw.pdf In PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/ec131ab8af0d9d0e7589dfa7321a9766/86817222485.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/duwenirakedaxu.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce1751dd6b---95349804520.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/7462486659.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/dajupegame.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080f9aaf0171---siwegamuta.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/n97amluggb25vga66chj8s010m/87356145202.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/3478d027497a37f150e47cef3f6fefdd/xovigunifakozop.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/40477309611.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/50066836760.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/d78d168088b87793b078ad09276e7b83/67799557148.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/7gpnm63a091dmii8jgukrr18tv/51996488892.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/5831662441.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/jedulomefebexanepubajepep.pdfIn PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/muvopaxawolobometatubex.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/86443294950.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/adc0e3492301b48fbcf90c92ade8442e/70074271336.pdfIn PDF document text
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/wirisi.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/23076662673.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=triangle+that+has+2+equal+sidesPDF link annotation
    • 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_off0000e3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CC 10736 bytes
SHA-256: 2f442da535e1e71118804c7123692ee7491fa916532e64692225aae0533a2120
font_01_sfnt_off0000fbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F4 16168 bytes
SHA-256: 1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68

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