Malicious PDF — malware analysis report

Static analysis result for SHA-256 504b9debd23ffd87…

MALICIOUS

PDF

94.6 KB Created: 2021-09-02 09:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6b030d9a1c1b332e49092554322707a6 SHA-1: 8de7d9b13d50fa784bdb05d54cd68028d3b34cf0 SHA-256: 504b9debd23ffd87e044de21b1a82b8a786d58bdaf5dabcba38946f7c1f00efc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://jmvlpslimited.com/ci/userfiles/files/80773088639.pdf In PDF document text
    • https://twr1115.net/files/fckeditor/file/zosepimizuv.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/forulerokeriwabe.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ffa26a992---24148462879.pdfIn PDF document text
    • http://strandedtattoo.com/file/21122749698.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/10237692614.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d8aad195fe0---75813794803.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/0bfbc76b33fa6c57974694553360895a/kuzomefivuvutepof.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/19498244463.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1610c95f6e181a---33942510131.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/61931137655.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/tdsm2hbmioi5ml0uf6sdivd3q1/mojerapiwuvopane.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaa73a9390---wepufiz.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/xibenumazirojofe.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/torosovexelezedig.pdfIn PDF document text
    • http://o2ashop.com/ckfinder/userfiles/files/siwuregofok.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/7628568619.pdfIn PDF document text
    • https://digireg.cn/upload/54921512231.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/5a0e5a4aee137b237f8fed870690ded7/8746322043.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/44687342434.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/10717414025.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/6798012ec777f6bba39296352e5a494f/bebojifisinorepopojetarav.pdfIn PDF document text
    • http://gewald.ru/content/Files/xupevoropemozoramakewoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=ecuador+is+known+forPDF 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_off000109ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12211 19500 bytes
SHA-256: 4307e2397e6a1ba3c7b73f30112159e10182c160e1956daaf0fb486b66cc9376
font_02_sfnt_off000154f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154F2 10452 bytes
SHA-256: de1c1feb176bdd3d01a44795119742991f158c36e49151abc1bbc0a0ea31474f