Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a1bb9873920f67…

MALICIOUS

PDF

76.4 KB Created: 2021-07-02 01:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ea52580e1ada05a4ffb188b25dfe3703 SHA-1: fac72d2d0ca510cf2877c775b45c4d09b1cceb01 SHA-256: 73a1bb9873920f6738f5bc14fcd503b635f89d21cbaa8891665f8e9b8966a16b
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to websites hosted on potentially compromised CMS platforms, suggesting it's used to distribute malicious content or phish users. The presence of multiple PDF link farm heuristics indicates a deliberate effort to create a network of redirecting URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://coinmarketsuite.com/ckfinder/userfiles/files/kebepumajex.pdf In PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/sodoxal.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/38dus1u8jf3un0c2d8vk978835/63774206315.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850e4a5bed5---gogaxiloviwezubar.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/xelejop.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/be195ed4aaa6e541bf1f1863eb1f2b1c/29625129466.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088f4ed28d84---31338498236.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/e717dcbf58d76b5fe2592233049563cc/3252287565.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160765cdeaab11---wugumavakonezebebe.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/wilazavodugebos.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090399dcf2c6---66585592520.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/xugujogowodebir.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/0d7723d6988b775ef238e2b1ea584248/fazugadikojufoba.pdfIn PDF document text
    • http://citra.cl/userfiles/file/fadupedabojevagujijetuzi.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d648584ec23---foxixidarep.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f93135fcf---54926496524.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/6b405846a6c4f928d57e4f79be73bd76/15314729598.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/xebuwilariz.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4bcaa90bb---fadetekuza.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085a8103c693---silisomatofifajepuzised.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a40214d7352---152387669.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/rewivumuvazoxaginogizor.pdfIn PDF document text
    • http://incucinaconalberta.com/userfiles/files/tujudebixapexojub.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/gp4dan7i2odhcrh5pd4bfafpp5/77501832101.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/64801402551.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d77cf91fcb8---vewobujetofiduseragarujiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=science+for+tenth+class+part+2+chemistryPDF 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_off0000c7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B0 11052 bytes
SHA-256: de7098baf507d174e396fda1a194972b1e0a546e9394771fbf56befe7770cdfd
font_01_sfnt_off0000e150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE150 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF962 16616 bytes
SHA-256: 3f651ff5316c50e10069a3af9c9963e06c6dbc43592a56cfade5a09dfc55690e