Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fff91571af2a333…

MALICIOUS

PDF

78.8 KB Created: 2021-08-13 19:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 23ddb35ef73c8f9aadc897677921a492 SHA-1: ab95fa13c10e3f10f6fac6f4d3b555e134d25d80 SHA-256: 7fff91571af2a333d6bdb3a1e5552558824af3d68f31842bac21b38d0f050a06
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to leverage search engine optimization for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://vrrc.heart.net.tw/ckfinder/ckfiles/files/xuzuv.pdf In PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a9be89933f8---demoguvorowudulak.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/84314014051.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/3637997390.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/16690106314.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/81100884195.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/sagaxerilatoruzumibenem.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a18135a2bc9---pikototet.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/97914769794.pdfIn PDF document text
    • https://lordoptika.hu/files/files/92076235244.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/35652747828.pdfIn PDF document text
    • http://grandinspirations.com/clients/75274/File/wimalupap.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/74cedc89c1ec674e652398448661e698/33431967216.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/19432791654.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/57416167313.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/74604697263.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/93bb5e15ecba1d13dc8d1f3c02ed02cc/sivepemotig.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/d7e9cbe2b1ec875adc8acf6e759c3451/tejuditaritegigaku.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/tajanagexufirarixa.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/37420f944c0a5e1069e0e9bf79af73fc/vuruziwuxugibunufekixagex.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b0d95d206---31489972243.pdfIn PDF document text
    • http://varanini.pl/userfiles/file/vomelagelitime.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f9d1ec53c---norufudewol.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e522d03595a---53874708028.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/jejurimukanikulaguxo.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/0e0bb90167eb36dfb5887060e7c14262/dofigafes.pdfIn PDF document text
    • https://chauphongasia.com/wp-content/plugins/super-forms/uploads/php/files/clvmmdamb5u9ho694ak02jjimn/kuvot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=50+sombras+liberadas+pelicula+completa+en+espa%C3%B1ol+youtubePDF 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_off0000cc6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6A 16928 bytes
SHA-256: fcef068b9b7c4e7bf71db911faa65b3c12632a0cb82b2efedee1dfd957e15af7
font_01_sfnt_off0000f73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73A 11392 bytes
SHA-256: f13563b42bdf27647978ddaa8c8c1d95d6f2dba3bbd6e78244023e9b763a0603
font_02_sfnt_off000111a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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