Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fa18439c9e8116e…

MALICIOUS

PDF

92.4 KB Created: 2021-08-02 13:35:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 03fa56c5b97a0a78d7ffbe2c3042e8d0 SHA-1: 9c21647d8490b3419029b50189b984a1b3ff4c3e SHA-256: 7fa18439c9e8116e34b396899b38b372459e255406c6c03bd427e0ae0ba1d6ae
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites and disposable domains, suggesting a phishing or redirection scheme. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The primary attack pattern involves luring users to external sites via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://islandpointfl.com/userimages/70425908166.pdf In PDF document text
    • http://gazosilikatnn.ru/uploads/files/57874845617.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca9deeaf11---koxowosurivibomisax.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9e327f67f---54678150191.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcae537327f---81905498416.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/41121650163.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210731044138.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/77754155194.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9a5de7f53---wosolerixunoloxeb.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/nevazudebun.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c12d3be6c8c---rubikezupidubaxixad.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/h4mtn6v9afh7oa17gijll6t8sp/lezozasudagatokok.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/92783359622.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/94514932942.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9ad051989---58897269798.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-7-10/20210710082908610542.pdfIn PDF document text
    • http://olneyjune65.com/clients/d/dc/dcef5d22f85ec69f5810ba62c2e8cf46/File/35681537945.pdfIn PDF document text
    • http://humanlitech.com/files/files/waxijexa.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/87512156121.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/bb484ece598e8415fccaf914330d8caa/35268559062.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/1757520600.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/onhqg1l0uk4v74ja42275qdnlv/4791850220.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/mewozuteravixigolajisef.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/5c69c3165652ca62da3b7b027e02d189/voxezijadawu.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/dodujes.pdfIn PDF document text
    • http://waberry1969.com/clients/877040/File/nuxufufajusonusivol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=what+are+the+techniques+in+teaching+literature+in+elementaryPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750b616e77e---40883432780.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_off00010533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10533 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D45 17344 bytes
SHA-256: 519ce9f2910f59eda0c86751baf3c32c7c93a31460c5a65b4462ad952ae2847f
font_02_sfnt_off00014a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A01 10912 bytes
SHA-256: 457059a777ef263cca395ec163b5373dba6221bfeb81b3d9ab05d29707aad0b4