Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d619ee82fea7dfd…

MALICIOUS

PDF

88.2 KB Created: 2021-09-18 10:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 691765c5df31e591f8dafe79a595ebd6 SHA-1: 7e13aa6d3bc289c1f04fe51b046f14a1993aad74 SHA-256: 5d619ee82fea7dfd9d28cffbf632d3fbd9eb6c2340682f2b328d480ed51bc076
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous embedded URLs that redirect to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm or redirection scheme. The presence of external URI heuristics and link farm detections points towards an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://pixomot.ru/uplcv?utm_term=muscles+connecting+scapula+to+humerus PDF link annotation
    • http://cke.hk/userfiles/xumulorofipub.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/81810008375.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/64709826171.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/74347891514.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/44850506388.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161458b7701b7a---91029188275.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/namekidedug.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/jigajibe.pdfIn PDF document text
    • https://primer-spb.ru/files/files/65456802561.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613af67926dce---degagepem.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613886b822881---61142107683.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/6675906039.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/lb4lh93g3jj43m8pas59uve366/96622024567.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/rujumu.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/xuledofijemaladirufekiga.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/18841875886.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/3456028012.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210913_113702.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/lulefuxikawuzafu.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/46904587755.pdfIn PDF document text
    • http://mebco.ru/images/file/xazujenepekabepitof.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddb0184fbf---kojuriz.pdfIn PDF document text
    • 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_off0000f473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF473 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8A 10916 bytes
SHA-256: 0970268de0b7cbc602ec97aa909d7233cac0c0d1c507362eb19e48f90577bf4d
font_02_sfnt_off0001259c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259C 17668 bytes
SHA-256: 3fd7fa94899226bf34e5ff444338b8d79d574c5fbb3f51f714c4c2407c6e8aad