Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cca8dbb407ff542…

MALICIOUS

PDF

90.3 KB Created: 2021-08-03 06:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d4fb47a0a787cec3e50ae6f58a365a98 SHA-1: 01e0bbc0e4fba14169ff42f90c05b799e67c448b SHA-256: 1cca8dbb407ff54286e188a214fd428659b27531cceb4fb34230b57114cefbbb
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The embedded URLs suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://federalwayhighschoolclassof1970.com/clients/8/8c/8ce2019516a67423f07d8eefa67dd611/File/zalisofudefonivokanim.pdf In PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bfadc145202---79611066422.pdfIn PDF document text
    • http://platcometals.com/images/file/gobivo.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/90039985585.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/vasukajavufaf.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7f2fa2e38b---95340081628.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/tatezijegerifufok.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/n6md150964pr3ldo1vo0oh82m5/busadojososipeteduva.pdfIn PDF document text
    • https://pavimenti.pl/web/uploads/files/jedanodunewetutikike.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/83072284249.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/zovataloxowere.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/nuniserat.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/dividasawubefolajogarifo.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/cd834afd62b42f3436e2ebe6b4be3b47/nodoretikurepimeka.pdfIn PDF document text
    • http://kuppersbusch-center.ru/uploads/files/wapevifoxezudemopubeso.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a713706ef65---95810459427.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/mkfisnaiqtpaspbsqgof5i8in4/70220971085.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/tinufisim.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/72423324824.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/nuxadipitujibataji.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/36180226802.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/18654402074.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/patananaxizadudorone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=trackmania+nations+forever+download+androidPDF 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_off0000fde7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE7 10844 bytes
SHA-256: 1bbb51e3119fe0e590bc809eb55077311bbb7328de3c7f76d38689830acfbbd2
font_01_sfnt_off00011708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11708 16972 bytes
SHA-256: bebf39b00e782d1dbc3a62671a37781dd1594788be9ffdf760115f7d964163c0
font_02_sfnt_off00014321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14321 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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