Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e36da99c8cfdb27…

MALICIOUS

PDF

78.8 KB Created: 2021-09-22 14:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ca6704d53ba21f0287418ed6f678641a SHA-1: 88a29c81050f5bcd0edafec19b54bb42b7e11d22 SHA-256: 8e36da99c8cfdb27cfb8ebed36c2225bfc5e68296ba68de106a66660b68244e1
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://catamma.ru/uplcv?utm_term=can+you+hotspot+a+firestick PDF link annotation
    • http://france-ex.com/images/blog/file/93893036128.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/josaririxi.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/10157920927.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210907060630.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/46668083119.pdfIn PDF document text
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/tegan.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/rauk1m7mof9nkjup5e8que6f34/99396434946.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/jiretatodazifupimapemajin.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/161494916a1312---42450371499.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/33907819768.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/18407838472.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/waloganojibag.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/jhr3c4v7l0dbvd6jv7ng9dge8j/zulefivevuwixovaxe.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5b026d0c8---6846906274.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/35137739948.pdfIn PDF document text
    • http://yoron.net/up/files/kofesaseviduno.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/243f47693f947e4837e33e2399918fb4/fulenozoba.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f27bfd77c9---12191605210.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/demoreruvadinenodowakid.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/67504364789.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/970j7tnsf5jh95u2nr6skkj1tf/wugavasedo.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/babakoganogipakuji.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/75814951492.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16134cf9e59bbc---zijotaw.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_off0000ce8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8E 17872 bytes
SHA-256: 22caa303a21f172d2c7e863952759e33fc97e84ff03d8167dad22acd81e75a45
font_01_sfnt_off0000fca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA2 10868 bytes
SHA-256: c0579be91fb311198e8acb11d98c2249265e9864c0bbaeda8eac1ca5f986912e
font_02_sfnt_off000115cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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