Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c7789ca01e6fdc…

MALICIOUS

PDF

70.2 KB Created: 2021-08-30 14:27:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 747cf1c1e4c9567231993da96c821f92 SHA-1: 3bb033abc989f933dd37c4ed76c689765813ad12 SHA-256: c3c7789ca01e6fdc0fe2b393ebc9a8ac535a058fdd68078c97bb14b441f85b7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8434

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://vettercycles.ch/userfiles/files/24518998218.pdf In PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/599b67ff11d08494326c352233f020cf/65405410256.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/58736484540.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/53872477339.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/k6nsfh04p9fok9k27lmkv98jst/71262768598.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210708173029.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/79692909644.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/04cc1cc6c5bf72fae41ac93abf61305e/bizozubapaletukaded.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/butoremofiwenikus.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/7cfde06ab2bd774571ca1ef1b59abc5c/23320874437.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16090e057ad3a7---53147229226.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebb7743df4---9207995991.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/foravukolazakuvu.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/46430514791.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/kghudhnhe6ugbr39akjif5evk3/19526697183.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc037576ef---nakatafivimolutedobususo.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210719221310.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/vozaguv.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210702_974DC2E2200B924A.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ff7615d37---6911542953.pdfIn PDF document text
    • http://goldmustang.ru/files/files/xubafipitajuz.pdfIn PDF document text
    • http://edelstahl-berlin.de/media/file/kunetipotasikos.pdfIn PDF document text
    • http://lactopad.com/uploads/files/kudogobuxa.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612341c50fb52---jutufalirigelovamadogerir.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/fukekiguzumapupazit.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/10876495302.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=cleavage+in+organic+chemistryPDF 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_off0000be0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE0E 10888 bytes
SHA-256: e452f29c8d09e2f1c461930376901fdfcb471a61d0108f17b499f5590555a917
font_01_sfnt_off0000d721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD721 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF33 16340 bytes
SHA-256: a903870f0c89be0a4e24cb37adeb24adcb58bda805a69073c909b71ade77846d

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