Malicious PDF — malware analysis report

Static analysis result for SHA-256 93fd3e1c8a8b7c55…

MALICIOUS

PDF

96.7 KB Created: 2021-08-26 10:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ab1e2f69a16522f16e3030b25e4eda2e SHA-1: c901a9e2b8005ac2d5badd6e41c1a511a34d5bdc SHA-256: 93fd3e1c8a8b7c557222663ccd5f389128bc4497f0de4e9059f03cb940fa36de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and link farm indicators points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://irlanc.ru/uplcv?utm_term=claiming+personal+expenses+as+business+expenses PDF link annotation
    • https://verredistri.fr/xmedia/file/32795757468.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16090caec63065---14271231394.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/7c4f9994c2b35b4e59d8597474227a34/zajulitu.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/worelitepoworevewew.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/e95a391a1a5dff1d497932f0bd2f61e6/41976115398.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/69152719393.pdfIn PDF document text
    • https://digireg.sk/upload/17178536868.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/dinon.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/4d044cf87491d3f7fa4a9413e42f67d7/76352001214.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/dae6f52951060770297ba5dadf630c60/lizeg.pdfIn PDF document text
    • http://bawwabatrizq.com/userfiles/file/xetasuxuzi.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/252858677.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/96ae75d5c98fa4337565554752958963/12449564618.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/basodidetoverejefanimoxos.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/9481dd0ffc7b392d6238c138f4c0c21f/40776071013.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/53404899138.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160893fc6a3972---tadigukejeledo.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/sibepamulaginexobofopuwoj.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f71f64bb93c---13098459352.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/7309b1c5faf47ba62be44d6085efa0f5/gubef.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/c479468719a9a554ff76424f77222963/tumotozatolavitoge.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/63250582491.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/dekakutifedixewuvefo.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/4q4fip248281dc81fleqb2kmi1/4419054413.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_off000115cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CF 17180 bytes
SHA-256: bf3630f457eb8aab3d439e28e432a63732e7ac9b5d36c4f3ff6bb483cab9316d
font_01_sfnt_off000142dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142DD 10868 bytes
SHA-256: bd15909f1ba115d7d9d1c2dc36499cee6d975227c1ddaaaa58eb69d46cfb39b6
font_02_sfnt_off00015bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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