Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d8577eac70e1c89…

MALICIOUS

PDF

76.5 KB Created: 2021-07-15 22:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a355802ad879f43b9e5d86dd7869055b SHA-1: 0a71d2354cf90f71c45ff831fcf430250c7c6a4b SHA-256: 0d8577eac70e1c8918e7b76eecb5d864d898b7655b2e5a59f630ebb670221a3b
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of multiple compromised CMS upload links indicates a pattern of exploiting vulnerable websites for hosting malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6826

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://merrygoldholidays.com/ckfinder/userfiles/files/gudojoxuteruj.pdf In PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/49037186694.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6ffc73eb6---bogerimowexokogavodiko.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/43687346740.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2pnmoh23cdpt91ulotcc1j7pf2/33748259079.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081fc4caf2a4---36650084597.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc37d7c83d---13091608902.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982551d256d---xikenoguzupe.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba06b3b43b2---19106870049.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/67410098773.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084856ee2555---36292270955.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/73716744507.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/vfaftp1b5gvic9ii08ck2dg4ie/bikujoraliluxuzojika.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/20ihif0r2dhd1cd3a9jbstc685/vuranotodog.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/mivunapoxebabosobi.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a19416e5142---80758074656.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/9013428436.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0aef60eaa3---35621727733.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb2b076ff6---69058993516.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/ie9sun2sij8ep93n5c2chrb405/37118842341.pdfIn PDF document text
    • http://sport-way.ru/img/file/88845401315.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/nalor.pdfIn PDF document text
    • http://azizolace.cz/images/file/betuberoleturujovoxar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+draw+straight+diagonal+lines+in+photoshopPDF 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_off0000d784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD784 16416 bytes
SHA-256: e808df82e7530e99eb57761581cb597b18c2ccdd57d5dd5053b46ffc6a3e88e0
font_01_sfnt_off0001021b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021B 10748 bytes
SHA-256: 19841f8407e16b4e2d8d70a1cc7b07d9fa5062b05a37bcd42d9b96f00acc255f
font_02_sfnt_off00011a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1