Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6bad3c19df98c93…

MALICIOUS

PDF

80.0 KB Created: 2021-09-17 15:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2b633c06aa21c0c9efb35d251b22d421 SHA-1: 680d0cd944c69b32f298098af6cce9be1237be60 SHA-256: a6bad3c19df98c9344e14f55c0ae307bc8d1b287dc09c64847eaa7fe6b3b90a5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the phishing lure. ClamAV detection and ML classification confirm the malicious nature of the file, likely a phishing document attempting to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://coretry.ru/uplcv?utm_term=android+users+in+the+world+2020 PDF link annotation
    • https://concertwristband.com/resimler/files/nipevugerimalotumiki.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ea355a8cc---lapunomelusebozozoten.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614420b714610---nudigereluremurofo.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/vorokabepofuga.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/22535849003.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/zevujobufudirozozojogov.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/jegutefemojoxusixitudak.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/26699916763.pdfIn PDF document text
    • http://temple.mo/userfiles/file/zidisuxaferujej.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/27254269269.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/renuladolobufedituzuw.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/86899875912.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/wezevi.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613983da593a5---22609386072.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/livamiwido.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/lavuzupovobewu.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/gagozuto.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/diguvumibupaxuzopesosu.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/bororajuromiwupesufud.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/rurimibebedu.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/25188520736.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ecf4c22f3---74727092484.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/87852763497.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_off0000d0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CA 18532 bytes
SHA-256: cc95f975a72ad97ec66f7a3fa566ef31b422bbebff6bedf3177f79f997c8e7fe
font_02_sfnt_off000118ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CA 10592 bytes
SHA-256: 6497d85972a6e86b997f98f58ccd9dd69448ebf2708e02b2b1773bf2524b29a9

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