Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc42d6504eaf43ef…

MALICIOUS

PDF

95.0 KB Created: 2021-06-28 15:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ab7a2a314b97a746bba9b677c9c608c8 SHA-1: 33263924ff1b4f2065b3ed5e9d1a9f03f1e0c373 SHA-256: cc42d6504eaf43ef59ce1b00af02ab1c4d9d3731c7b239b7b3791621b2038011
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 0.9956

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
  • 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 http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc5b8f056e---basixudevazefewot.pdf In PDF document text
    • https://bestcoloringpages.com/userfiles/file/gutusowebidefodotidejokak.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/fk1drv9ivo97175rju3i8phl10/15845982608.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/56652057367.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/duxixirupunugafipewijoxud.pdfIn PDF document text
    • https://ienter.bg/files/77838598064.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864adaf3bcc---xememipogogaboxipenukot.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/45173536510.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/4f4a44ac93d45e6396373acc2b69e81b/jalegasop.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ae81ebff8e73714f6f501f727b4ac9ff/seduwenenitovawekenufara.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/fafupinom.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/83434699529.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ror8o8tpup6mlvnpm3o2m1im67/94459116626.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ec43ba89a---1475413054.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/kowadorovozefudaz.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/8925fddc1bbe61cfdf3e534be696fd32/99381170220.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/4uf3l5brqfn6pdto910g3hd1e0/46660756477.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/735a80ae4c1be54042ed7de2a1c5f5ea/41702291620.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/banaturuvumope.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16095f7f284058---9410169739.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/fa803ea039265b43267972ac30a94ad2/bawufobukilepuzovuxazon.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/b1765efa9bf00abb638f9e993119d70e/28687539812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=biggest+wedge+tail+eagle+everPDF 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_off0001119e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119E 10404 bytes
SHA-256: 2092ece799af46659cc8a736496b7f13524a4282cf89fcc4bcbf28c41c959da8
font_01_sfnt_off00012929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12929 16940 bytes
SHA-256: f433e08701072e6783bd02b8e3b5cb5fb8df35c8b13953d942c52e81a272b0b3
font_02_sfnt_off0001556e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1556E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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