Malicious PDF — malware analysis report

Static analysis result for SHA-256 92780cbaf6689ac6…

MALICIOUS

PDF

98.7 KB Created: 2021-07-30 02:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 11f77d052fb4f1b0885cc25c736ca42c SHA-1: aa55ccc8f56b7dd19cdb5c49eaf60ada72cda9e3 SHA-256: 92780cbaf6689ac669a6307edbbad3866b29f61ca9884ff29f52d5be0d4ac2b7
164 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a likely phishing or malware distribution attempt. The embedded JavaScript is likely responsible for executing malicious actions or redirecting the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • 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 http://finalstage.biz/js/upload/files/zisanegovuwi.pdf In PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/m6fqn4hrk2d42pt0k4l21ti923/vatodilukosuremogapodob.pdfIn PDF document text
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c897f3325---75407482218.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/va84nrb3lbndfasq315irifkom/99288681994.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071970438db8---narofob.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/2pothb61mc0k6qevis7evq9n2p/71385430375.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077400fadea6---3528597972.pdfIn PDF document text
    • http://cosmickino.ru/sadm_files/nezemofetevuzuxak.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a60da44dd---tetos.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/68494584418.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/a19c8d0eaaba279e392cd0b899e2cb5c/30976856017.pdfIn PDF document text
    • http://proxima-design.cz/files/file/90528246323.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/51407146752.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/74368545120.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210628091746.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/364831000243010dceb60a7599bdbaa8/jepamosu.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/fevekonevakad.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c3c420f88---nidugiwagezakaxidagaba.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982b03d93cb---rolododipinimokuguneras.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/70412137365.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/gimojakotarepix.pdfIn PDF document text
    • http://biosite.ru/images/news/file/27474838251.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=%D1%83%D1%87%D0%B8%D1%82%D1%8C+%D0%B0%D0%BD%D0%B3%D0%BB%D0%B8%D0%B9%D1%81%D0%BA%D0%B8%D0%B9+%D1%8F%D0%B7%D1%8B%D0%BA+%D0%BE%D0%BD%D0%BB%D0%B0%D0%B9%D0%BD+%D0%B1%D0%B5%D1%81%D0%BF%D0%BB%D0%B0%D1%82%D0%BD%D0%BE+%D0%B4%D0%BB%D1%8F+%D0%BD%D0%B0%D1%87%D0%B8%D0%BD%D0%B0%D1%8E%D1%89%D0%B8%D1%85PDF 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_off00010d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000125a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A3 22760 bytes
SHA-256: bfbccd3cb30db73e6f15e5af23de95c53079aeca77b90a7ca6dc9e7f9738e731
font_02_sfnt_off00015dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DFF 11632 bytes
SHA-256: ee4e1bece0170ced42d9de0811aa9fa04c98ba2da8437474acc00ac6c7220b1b

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