Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7348fa56199f5f7…

MALICIOUS

PDF

99.8 KB Created: 2021-09-10 09:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e43f7ab79fd3ca6c0b4554b8dcad4227 SHA-1: 0dfb83d9712b72c2422a379e15b958008aafba32 SHA-256: f7348fa56199f5f7b306d26139aa7bad505d39e8cbfca242d3d30788cf3131ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this purpose. The ML classifier and ClamAV detection further support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://cructi.ru/uplcv?utm_term=what+is+the+best+gun+to+use+in+call+of+duty+mobile PDF link annotation
    • https://mar3ol.com/Files/files/22348029651.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/27264392528.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/refilugud.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/92535101785.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/pewumujivonidabupirik.pdfIn PDF document text
    • http://meta-min.com/files/rapibilabogofumexufobafa.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/8618262694.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/80640103634.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ac6a56acb---62867160268.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/vegafazi.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bb6e52788---28013353723.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/boruzivivanezutiw.pdfIn PDF document text
    • http://slsnn.ru/content/files/557346613.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/6fe7dd0e339492d72bca96bb36f388c0/lopetasunuwodazako.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/jawubodevubomonedudera.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/68272857303.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/1360943111.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090523111651.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/taliv.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/xelezemulasibogap.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/12371529868.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210903144719.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021090821515973499.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_off0001214d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13964 11172 bytes
SHA-256: 72c01528748d3d0613d41799193401b9a1a1f98ef1756ce47a83b37eeb28218f
font_02_sfnt_off0001531e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1531E 17816 bytes
SHA-256: 0e8d05a3e1f11d2e06489fe565dff04a66761f8c8362251ddeb50f6cbd2e3ce8