Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd79f8d66e549755…

MALICIOUS

PDF

81.8 KB Created: 2021-09-22 09:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bc63412467f3b7005249a5ae7c85dbd0 SHA-1: 5305e965bf4a4a95ee91523cad3a8f03a7ce1b3a SHA-256: cd79f8d66e5497553f9ea8a07a1e562c72279e7573a4d8e5636a628c825e198b
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://smidgel.ru/uplcv?utm_term=how+to+cast+redmi+phone+to+tv PDF link annotation
    • http://doubles301.jp/files/ckeditor/files/52148516028.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/sifutaze.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/rikeb.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/jigowasunopubesejibaxa.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/fegukiroluguwokigudu.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/57290109626.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/45253741005.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/33181188350.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/zowogebobanefevu.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16144d51f01942---bumivaroruwugavixor.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/41293224450.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/0219bb2fa869f1d05f33ecc353f0ec98/fapav.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/79868616312.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/98545634588.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/33862142316.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/gokexiwe.pdfIn PDF document text
    • http://gysanya.com/upload/file/210912095442276716fe9ig09j9ylr.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/3mvq04uo5q99o9qf5l3toaogli/78053435341.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/dokutu.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/nobume.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/161476f30bcca5---16336061326.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/75830680700.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/nekogajigi.pdfIn PDF document text
    • https://12shio4.com/contents/files/5068599575.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_off0000d7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00A 10876 bytes
SHA-256: d2006e092593912f4fc7cae8d23b273b2ce0a24bd44cd5dcc426a4ffa3acf25a
font_02_sfnt_off00010903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10903 18704 bytes
SHA-256: 1d227a39f6abd2e4df659b5ca33ef60b7dc0ba8646d89255feca7eed7aced958

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