Malicious PDF — malware analysis report

Static analysis result for SHA-256 d913826deeabd480…

MALICIOUS

PDF

77.5 KB Created: 2021-09-02 05:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 10178863ab23ae82fd24ab4d720afba0 SHA-1: e1709bed15134f6efc9463bef68f2772d41dcbeb SHA-256: d913826deeabd480d097be7d23a7b29f9084aa57fc1cf4ec4519d74ffc6a6f52
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues about its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://oniceh.ru/uplcv?utm_term=downtown+fort+lauderdale+directions PDF link annotation
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/be511e9625ca5f43cc0db3b79fd33e84/sexejavoduvenawa.pdfIn PDF document text
    • http://www.grifin.sk/files/jopuwiv.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/11288938649.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/21509476113.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a942a762e63---39867096985.pdfIn PDF document text
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/vowigevamulokezu.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/5201d9eb4e1810c1a7ca7e8eeca48d6b/1061736312.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/a5agrko7rud4os46p3quj0tg0b/xezowixenidup.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/69434976988.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/18605028565.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/8bd553c884ff416301572d6ced8c6c26/67598317325.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607240b4bec72---60958095156.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127699c58a9f---19193971793.pdfIn PDF document text
    • http://hzqzg.com/d/files/desikizobojaxororosolubi.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/ihaikndfbmjegkqb4dqeolval3/26681339949.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/08/14/file/20210814_143452_103.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/sujedorurodolejavexawab.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/susakinoseved.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/joranadukipogabad.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/wagajos.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/96809558491.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7b5571898851bcdaba2ea4fa92c96796/15814230115.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609844e676292---dodikifesexetuvuvi.pdfIn PDF document text
    • https://projetovm.com/uploads/files/83559693168.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_off0000c995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC995 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A7 16848 bytes
SHA-256: 03c558230d494fb4d3cd7403c63471724d5ec23d4e115063d2ef57260479c29e
font_02_sfnt_off00010d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D38 10656 bytes
SHA-256: 9bb60ee75858e52049bd5c38a3c4076ee3f7dead83a31df29ff0934a25a8de16

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