Malicious PDF — malware analysis report

Static analysis result for SHA-256 662b4ee1d23ff6f7…

MALICIOUS

PDF

71.3 KB Created: 2021-09-11 17:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 00b489b47fac6b361eee4c6736984ee3 SHA-1: c294af2e781779127c8cc8d629f9608cbac6d2b0 SHA-256: 662b4ee1d23ff6f7bf3b99f7327973d5bdef13fa518ac7a8f48fb5dfbffe7b96
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://queure.ru/uplcv?utm_term=my+xbox+live+apk PDF link annotation
    • http://ajmason.com/admin/ckfinder/userfiles/files/36526981308.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/96087753649.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7967c2f4f---53903223663.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/pivas.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/36490902540.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/98147588806.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/refowamewufo.pdfIn PDF document text
    • http://na3.it/misc/file/tazedizofitotam.pdfIn PDF document text
    • https://efnnma.org/files/file/66638059846.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/vadiwemigoniji.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/sopijavijaxirutimufinut.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134e3505161f---71542814076.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314ad096bf6---zopifujekavegikotixepo.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/52192187153.pdfIn PDF document text
    • http://unityproductions.com/upload/files/lifezej.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/gojimupi.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/36769982698.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/vidupujetosowez.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/42892346308.pdfIn PDF document text
    • http://fteq.ru/files/file/13374711577.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d71226507---gifogopapijanu.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/64497328645.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/77001146414.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137da8fc0df1---62262356789.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/2b8f515868b52a7f4020c650d066b51c/fojif.pdfIn PDF document text
    • https://atlantidegattico.it/file/67639086465.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_off0000b3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3ED 10284 bytes
SHA-256: 11eb3c9d12e1345dad81739aecc4b3bc901038d4173a35032f38faeae7eb8790
font_01_sfnt_off0000caf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF8 18432 bytes
SHA-256: 05ee6b5a15f3ea236a27c3503791f391a88d3759c8e8a144dfc7e53e88665347
font_02_sfnt_off0000f7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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