Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d5cf9fba22341ce…

MALICIOUS

PDF

84.9 KB Created: 2021-09-07 16:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4d642ce2b4571cbf1e0aa14c3f384e5f SHA-1: 3cb16088a553ce750235ef13c15b78517c6fab81 SHA-256: 8d5cf9fba22341ce23a3c1f7edda983cfac853745a1df032f0c2bb575ba57197
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised WordPress installations. This structure suggests the document is designed to act as a link farm, potentially for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b94ce5744f2---sujazo.pdf In PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/7bd7ef3e055456dd3494c0c94fb0f9af/81879143796.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/mebaduvojo.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/47657563586.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/6mhk1nv72tsutcicg22hc48e5m/19873392328.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/ls0ej94kge0u7mjuiff28amm16/lunoxesuzadote.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/f8103e084fcd647267aa8295137fad8b/kuvobizusuvosewipiruzawo.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077bca038c7f---8590637819.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c12099a9d---verabi.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/vozutupezobanalowur.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f19305403d---fixejurufuwodupatanug.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/70710121693.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/70862803373.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/sowupatavabevupavowuze.pdfIn PDF document text
    • https://papiratisk.cz/soubory/jozafaxibituvet.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/masupomafajubij.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/29384069517.pdfIn PDF document text
    • http://andrewclaymonfishing.com/clients/a/a7/a7b0d980ee28df7184f998a87a00dbd5/File/jererogepalojo.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/91120520768.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/1jgo5o32fgdnqdc51htqi691u1/zilejesaresepoxi.pdfIn PDF document text
    • https://eucolait.eu/userfiles/files/lipuxunaxinisa.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072da39d3905---jevemiguximu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=super+teacher+math+worksheetsPDF 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_off0000e640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE640 10752 bytes
SHA-256: d102c006e7cae2e10730f0c72a87954e1eae1123fe1cf7e4edefc3762107a183
font_01_sfnt_off0000ff19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001172b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172B 17920 bytes
SHA-256: a4b59f1d72b7e1d2cf0e1be69a1839af1acec6cafdb25d66918bbb376a8f7ea6

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