Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a711f7342ed018…

MALICIOUS

PDF

83.3 KB Created: 2021-09-05 02:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 11575ee1f419df87eb3a56bafb38f0ab SHA-1: a821479b00bbe0599907dc51017625e0176f9010 SHA-256: 40a711f7342ed018c60fbfde8fd53d1cf4d7343e679be9774176930121a7f2e7
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. The document functions as a link farm, containing numerous URLs pointing to external sites, some of which are hosted on compromised WordPress installations. While no scripts were directly extracted, the PDF structure and the nature of the embedded links suggest an attempt to redirect users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://au-coeur-du-temps.com/userfiles/file/wezavatudu.pdf In PDF document text
    • http://abimobiliare.pl/pliki/File/99546682520.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/41425865808.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607d557cc000c---besubalolox.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/91454496423.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/2q06c307ib89g0g6936qvh9kv5/buzedavadapizime.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/sugedusawevivezirig.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/xajono.pdfIn PDF document text
    • http://chieucoingason.vn/files/torodetulale.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/naxowunonabunok.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/nivaxinupogiwu.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/1c6f6ec1f8ca439973720e4dd0ceafdc/3522764964.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/kosisuzejim.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/zazoxizifat.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115035f9915e---rodedogozason.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/bbcb27f3da3e8a1fd084f8f5c022b406/47786598714.pdfIn PDF document text
    • https://pierreseche.fr/userfiles/file/26404410858.pdfIn PDF document text
    • https://invest.pl/userfiles/file/zobabaxenafujiferotojineb.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/dewowuzojopavonigudavupi.pdfIn PDF document text
    • http://anupbolivia.com/images/files/jelefaxukukatatiga.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875479c24ab---28010949220.pdfIn PDF document text
    • https://tmtteks.com/files/81766289242.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/161219eba4e30d---powokozugotodi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=diabetes+mellitus+tipo+2+pdf+medigraphicPDF 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_off0000dc90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC90 11324 bytes
SHA-256: de369756ac4c22dcec4bf28126f8e8ba3d8c40675ebf2775a40a86fbc009bd1b
font_01_sfnt_off0000f6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D0 18500 bytes
SHA-256: b1ce4bedc6e42d1b9caa2f084135ac69c981cb307fa2e938bd688a4ae8f42012
font_02_sfnt_off000125fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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