Malicious PDF — malware analysis report

Static analysis result for SHA-256 80f72779b38804ee…

MALICIOUS

PDF

84.1 KB Created: 2021-09-02 10:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7e701865e1fb432414cd184d251e9642 SHA-1: 9852217085717db5d69f7358da69bccecc8d6a05 SHA-256: 80f72779b38804ee198d6632ac96f1a0a8e00d04a5234b22e9ccf67996764156
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=when+does+gacha+club+come+out+for+ios PDF link annotation
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1612373b8e74a2---77295783996.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/bepifuzogumolitosafo.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/2884e148f52835f374185c77b37c8975/jimadorizuvaniniroxu.pdfIn PDF document text
    • http://mlead.net/images/e/file/mitapegexoziwilisebuso.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/wonim.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160df9867c1ce6---13198830712.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/nomuwowabofaduna.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/b87ce5ff366195527186cfb01b3dd663/17704765808.pdfIn PDF document text
    • https://premiersuli.hu/files/files/57750050499.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fac9310c8---mamufoxusuviranago.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac1c9f3700---nafubadavavusabej.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/78538107444.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/6ef7f5223d6f02d0affa1ffbace50320/jixuzukikavam.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/xarepudupejon.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/87738237854.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/12371576590.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/bf6f8d7663b2b640bb4b225415f285e8/33781153344.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/37713974047.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/f6d3329ec416dd91c8263a4603d7c8d3/17540912239.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/rawafalemidegodejo.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af92ca8f6fc---49397584730.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/fep9abseh9ekrncikf9dsu4m7m/92064384275.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/83627386806.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_off0000e04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04E 18312 bytes
SHA-256: 4635e8ca71ce17624da0c5972553a5203af28fbbf4a15990d27ebe4cc09e7cd9
font_01_sfnt_off00011065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11065 11156 bytes
SHA-256: 53b2f800770021a8dfce5955d6a69dd463d4fc2d3f2c4c5d7fcb2f69b55d1e51
font_02_sfnt_off00012a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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