Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6de1571a23045ce…

MALICIOUS

PDF

71.2 KB Created: 2021-07-20 19:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 99703bbd222a7cc799b663017c43c243 SHA-1: 0908a1b3fc38303213252371e68c88ee66fa4ea0 SHA-256: c6de1571a23045ce8513d26f98518b8e57aed75fbcc9d3d1541c220f741987a1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, directing users to various URLs, many of which are hosted on compromised CMS upload directories. The primary purpose appears to be to lure users to these external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02d7f5d7ba---76784590173.pdf In PDF document text
    • https://aimhc.com/userfiles/file/31836376942.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/cb982db2bfc8e60659dac3f72d3d5b8e/wuzobozapapitakiludapezok.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160db28953defc---90245544376.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/xiwelutaribu.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/j503mebdoa3p6n61a0q32s7sb6/kewij.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba55e08f8e---wipafub.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/toponidowaxujuresevu.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/50767351514.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608763b47fbac---momiwadiduj.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/99634440382.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd694921677---30826727193.pdfIn PDF document text
    • http://chromavials.com/d/files/61894170.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16093a35feaa2a---62029627510.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/a76e9cf8103e9badcd774d4a56727072/52233165291.pdfIn PDF document text
    • http://teraval.cz/res/file/wetofanez.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/88535653301.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/1932022531.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a6363b9eb---poxib.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/2e2338c46633373a0598ff0d6f912783/55645373354.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210704091947.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/2426635239.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///xakurepesaximiriduwasa.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8767d2602---37839936314.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=40+meaning+in+the+biblePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000b75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB75A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6C 15832 bytes
SHA-256: 264c7d40b5eef15ebc0045b33e4ea1dff2661eb2ad3b462f99c087c5c9f779ce
font_02_sfnt_off0000f827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF827 10412 bytes
SHA-256: 0826085a4069b9169b83ed22eaa28ddf2a6cf360400abbd2b2c763297e361044

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