Malicious PDF — malware analysis report

Static analysis result for SHA-256 d53c85c8ba797211…

MALICIOUS

PDF

119.2 KB Created: 2021-07-24 03:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: d023fc3a9ab1e94a4e9072299a7d66e8 SHA-1: d5ae4299745c44e1aba9938e8c3a78e717f987e8 SHA-256: d53c85c8ba797211bf615138888d17fd171d34eeacd658d9688fd9079fbe68f7
156 Risk Score

Malware Insights

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

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 0.9988

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://asiarsolutions.com/userfiles/file/xaxujatinax.pdf In PDF document text
    • https://norservis.com/files/files/xebizumulofutabu.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/4a9mpjv5ucibqfg8bbfi02i0rj/73440659243.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/49105499382.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed59e59cba---64924459435.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e1d846edf---22735505612.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/423340c5bb9307f45d75e8f801ba27b0/85370254515.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/metelelujo.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/fivinawofudesurelo.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/45183007640.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/4bcb53eb150ade4a60e4bdda79045b5e/7689218999.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd861a80c3---67118136250.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/75c9cd9bd0657c2a6f1f822ca18ffad7/20607589029.pdfIn PDF document text
    • https://inncredel.com/uploads/22824823085.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085074d99ca2---jikaper.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/51441265534.pdfIn PDF document text
    • http://geose.ru/userfiles/file/bumexulujuxogezobunurap.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/66188138677.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f1af1ea63d6---garabidutebirebizikasew.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/38025013474.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/74967726969.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/93118888804.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/2a31a6fa436fb0de43fd3c01dc47b733/28345715214.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094b2bae9c88---66369695474.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=which+electromagnetic+wave+is+used+in+satellite+communicationPDF 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_off00016cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CEF 11064 bytes
SHA-256: 3b331daf1f94475ca7c041beeb9d98a93f6e7eb704f0c467eabfd0e72d07b157
font_01_sfnt_off00018664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18664 17968 bytes
SHA-256: 325f9532c0682cad17d06821415eac6cf35283d3642544f3e15b678eb0fb2759
font_02_sfnt_off0001b570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B570 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1