Malicious PDF — malware analysis report

Static analysis result for SHA-256 9778c53a6103d64c…

MALICIOUS

PDF

78.2 KB Created: 2021-07-19 02:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b287cf43de5b4036df3f27c604c5fb80 SHA-1: c62238998af5fcac483f42d2039a8eaaaf6c6f9d SHA-256: 9778c53a6103d64c3cc74fc82ff8ed0703d2b1b19b512a048e0e1835e14d3e15
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external sites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm for SEO poisoning. The presence of a 'download button' heuristic further suggests a lure to download malicious content. ClamAV detection and ML classification confirm the malicious nature of the PDF, likely serving as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://pinturasoltra.com/images/slider/files/vewafuropinorikusomaxob.pdf In PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e9ad3a5ff---maxoxitata.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/jejowojumikojife.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fusinoxokinileziw.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084a22302882---83562245273.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/af46828328c5f0c8d8180317d28819e7/23593873260.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/baketigewofuziregeki.pdfIn PDF document text
    • http://katachizu.com/img/news/files/vivikatovibomujesisev.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c12ec052---35620905499.pdfIn PDF document text
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/79532680030.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16092bf49daf86---zabiledige.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160986745a6fab---mamexomamixosigogujog.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/963727118273fcd5b1f61da0bc5aac9b/gagiro.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/4dca42f470aebf26baa5d0c97684eb76/muzidifalepo.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33a79ac61f---zixosidugixezimegipalofek.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/74130096128.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cacdf2e0d39---8909651504.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/33320623802.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/2m1ic1o3obgbouatttco7ija56/zawova.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfb1c302ab---47034065611.pdfIn PDF document text
    • https://globalquestconsulting.com/userfiles/files/wexopotifirerefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=jefferson+county+clerk+and+recorderPDF 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_off0000cc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE482 10672 bytes
SHA-256: 20256dbc797fb64f4f491b560d57b4251bef7a9c0432932027b47abc176edff8
font_02_sfnt_off0000fd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD32 17500 bytes
SHA-256: 75e2a801ce56fca32ba8f55d093fa9a21287e103a9ac2496596b21a0a9ace269

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