Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0c560490bc6ec88…

MALICIOUS

PDF

73.4 KB Created: 2021-06-12 22:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: f329df897ce688771450bf991c366d72 SHA-1: d828dd88c9cec700b1d9fbb4ce30950617c1d027 SHA-256: f0c560490bc6ec887bd5a8ae2642d10b72b2c9a76b4ef3dae9a5cd103d2815aa
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised WordPress sites and other domains, suggesting it functions as a link farm. The ClamAV detection and ML classifier indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links and disposable hosting reinforces the malicious nature of the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6398

Heuristics 5

  • 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
  • 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://catamma.ru/uplcv?utm_term=spectre+2015+yify PDF link annotation
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/5491d74e32c64bb837e3bfba34f5f320/fopolebuxekifasijula.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/a47obh2u9oqnrm35d6ktobvmee/63365515923.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/83ec8333263f80c5ac23b446e112fa5c/fotadonupi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7d3a60d9e---puganowikulokoja.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084eac281b90---95384530225.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/3410964131.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30802168461.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/93eb266657695cdb1d750fde09bb853c/jivaruzoz.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7dca96a04---kebob.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/36889526450.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acff4ee15c5---49008157448.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16086768b8ff36---7837694820.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/430aa70a8b81ec8b6b7482f41f30f9f9/garagimuson.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c60592b583---jepisudowajuru.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/38697518200.pdfIn PDF document text
    • http://freeski.hu/freeski/file/63862155134.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB42 6060 bytes
SHA-256: 9e0df3660f6fa4b920992069bc4bd1fad9dfee6637ada100faf2530835f5b771
font_01_sfnt_off0000effc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFC 5244 bytes
SHA-256: 4e4de7c56f820823d66e24e6d7e004422138aef6408f25a58a75340ad85ee06b
font_02_sfnt_off00010201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10201 11572 bytes
SHA-256: d37428545d9c1055a494f537036aaa050cc46d85ca8756024cba2e2fab739ba5

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