Malicious PDF — malware analysis report

Static analysis result for SHA-256 f853890c0b49ccb7…

MALICIOUS

PDF

76.2 KB Created: 2021-05-10 21:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38a08d7e95c1b4e921b3516cfbf53a01 SHA-1: 2b8d9be2b8f64d31951958f1228401da46ca1193 SHA-256: f853890c0b49ccb7b776aac189101be4ffc46cc774686e4258a28ccfaacfd05b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, acting as a link farm. The document body is heavily obfuscated and appears to be junk data, suggesting the primary purpose is to host these malicious links rather than convey information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9291

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 https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/01b7de3954d8f6b3438bda2678af7c60/97653365545.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf3544c36---gamosipixopumaleki.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f754780e57---89624277811.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086d7098e117---mijugado.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/saq6oos7vqg0lkf3tqauurfgk6/kofok.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/7ajse6v4ua0bv4hul8jrn1du01/75057715564.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/97gg6pbc9d8rpg4si9ee4j8hq0/vobobe.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/ah9re1bvnj8u7gfinrtul7trv4/51013267609.pdf
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/67ce3d6cd685f7fcb4c1a97dd131863b/lasikabixup.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/gspm40sunbi6d9s8r28re20e5b/rinevapabunazolefebenab.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b80d84d172---fodemivituwamo.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/3nl8mgh4lf117hsvnegrq2ejbp/10871692410.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/o84el05vu2cjut0ga9cd455k6d/20402313616.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160928d1f549b7---ruzojisafili.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f756b96cf---92428770077.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/j3nc9hjfsn7phhs59o6s8un1u5/rikevex.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed68af2d66---45590878717.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=business+plan+template+for+startup+business
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec19.bin
78ada0daf20f8ad1e42d5d761a8dcc26222583c1d970f89ce36cb08d22265f1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC19 5116 bytes
font_01_sfnt_off0000fd5a.bin
7943a2c13e1bdae460cdf08420811e710c9e43e056e7e2deee55844ef5bf8ce5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5A 10652 bytes
font_02_sfnt_off000121b9.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121B9 4324 bytes

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