Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f1ab47c63df69d2…

MALICIOUS

PDF

83.9 KB Created: 2021-09-11 01:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: db807cbaacd2468ceaa7467b405a57d8 SHA-1: 3dfb23abaf256c78bdb7603efffe1ffa029d0829 SHA-256: 7f1ab47c63df69d241f3105c31460e7d6755c6c9eb3f78fd7412bc752466f40a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, with numerous embedded URLs pointing to various websites, some hosted on compromised WordPress installations. The presence of these links suggests an attempt to redirect users to phishing sites or download further malicious content. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://inwebjor.ru/uplcv?utm_term=how+to+play+old+pc+games+on+android PDF link annotation
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/ramozomelolurolemakudedu.pdfIn PDF document text
    • https://peperita.it/writable/public/userfiles/file/dafifojiwuruvab.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132de7c6132f---paroto.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136702d623bf---jexokegopoti.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/juwatojowevemewufenuti.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/jekebujumexisomuvazuf.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/84247469456.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/vedujedakasokivakurisepip.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ku1vkld7idu4atel6stu4dcbp0/fovibigex.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/dilumakoremetulaxobasivo.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210906081832.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/kopeno.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/s29qv6kb0jk7uh1u1jrkptud2u/93324900522.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/vemovazemakunibebalasuj.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/pivuselofijutuzi.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/16995566506.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/97042275616.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/viverimezigun.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/48953869073.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f4e35405a---2828099551.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16134d96f75359---97219254309.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/domulepit.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_off0000e36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7E 17788 bytes
SHA-256: 3c77d12cf17c29a23e6afd99fe362777e18cd887ca2e3ca3e08fd666ea359c42
font_02_sfnt_off000128de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DE 11048 bytes
SHA-256: 5cd8a6f9c8d359bdf36798fd58576c35b57fc72fa5cb1206303ddad8516083ac

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