Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d36f06d34981701…

MALICIOUS

PDF

129.6 KB Created: 2021-06-23 10:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 01e4e0ad9282c9ca9b02905b5cccc846 SHA-1: 0af04d7076d21b6e02831d92bc0954d204f08008 SHA-256: 1d36f06d34981701af6c3c686ac2603031aa440b479ca8740cdad12bf45c07fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8471

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c7f196634---sukidokazowevatif.pdf In PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/50643378376cb41c4d5b46ea3fafe748/numebufezekorufigometu.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b6a0e5d48---sukubowurile.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/49613462752.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/wolesegaf.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/40625862723.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/954l2je36spd2rja16v2nlfbq4/42917682138.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/a7a007c91a7f4f3f96f23c9619c718e0/30511743085.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/b59d30c6f84b5e19d354d9ee46e1b18c/84635142479.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160905aceaf52a---tewirubirutegijogetut.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/e21f87c6f4a016951fb07d48eff828b7/zigamojibarinet.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/guwarogowufakipo.pdfIn PDF document text
    • http://sns.hu/_user/file/79648392474.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d2cd8bcf04f---mekomurepika.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=blue+planet+project+alien+technical+research+pdfPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7E2 5248 bytes
SHA-256: e8ca10f40aed1e5009be5908c970adcae4b426b51961430cf1f9be0c6e51f540
font_01_sfnt_off0001b9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B9B5 11004 bytes
SHA-256: 5c58f80f84dc5e38d6324b988206fafebc1410e0f5a16767f818444c7a385aca
font_02_sfnt_off0001df6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF6C 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501
font_03_sfnt_off0001f49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F49A 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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