Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae35e505fa3ff761…

MALICIOUS

PDF

83.3 KB Created: 2021-09-14 07:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a75ec85e6bb04947fa228b01e979d9e6 SHA-1: 11cd1aeb9bfa70604025a3657a1a19dbad5acb8f SHA-256: ae35e505fa3ff761b839310f47e7c62d162569c532d7febee9793e52767de056
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, indicative of a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs are sufficient to infer a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://techsystem.gr/data/uploads/ckeditor/files/8885853576.pdf In PDF document text
    • http://zimmerei-possert.at/71103015079.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/kajaderup.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/bubelonifu.pdfIn PDF document text
    • http://asvpp.fr/pdf/wowam.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/16077438424.pdfIn PDF document text
    • http://szcftz.com/upload/xavufimesenolabutubebubu.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/wizetevaf.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/72502129964.pdfIn PDF document text
    • http://vps73.juicy-group.com/editor_upload_image/file/fetowinutozexoxujawale.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/73726353558.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/merulekomerubezalojug.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/265f797eca44bb7fdbc36a43a802d818/robepewuzuvatigi.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/21409883764.pdfIn PDF document text
    • http://qdjshg.com/files/file/94995886171.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/tamafujogavamerer.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/1ed5e2c1c4ce4c204af124bf6f11b8c7/20398116817.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612effefe31a0---mewagelulatipetube.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090415272633.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/66177456187.pdfIn PDF document text
    • https://mcsfood.com/images/file/xokejosakukuwipuvawerimiw.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/58917256608.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5ee931eb9---16830959541.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=hogwarts+mystery+hacked+apkPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB88F 11004 bytes
SHA-256: 4b1c5c12fe89599c69fd16267efb7f509d7c72d47e9049d85912ed52277710ed
font_01_sfnt_off0000d209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD209 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_02_sfnt_off0000e794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE794 21396 bytes
SHA-256: 4d5be5012c5c1e7b4bd3664c59bec5aa3602eded015cc666fa79471c63960c72
font_03_sfnt_off00011ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000136fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FE 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc

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