Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7822b4bf64b7b7c…

MALICIOUS

PDF

72.1 KB Created: 2021-09-22 23:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 36a279fed021209af28154e2bfab01fa SHA-1: 5cf69f448db3d26ac9dff8e98a387e71ba94e912 SHA-256: f7822b4bf64b7b7cb1d3663139d935f6a2b9c67798a8018f438fd8d0dca1b811
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to initiate malicious actions. The document also functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS platforms. These elements suggest an attempt to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://rpsbchamber.org/editorData/file/94517867110.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d12d1e5b73fee9ca433b9dccd1b1a636/41378702398.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/161328b79ae746---53851089394.pdf
    • http://www.prodomasa.com/ckfinder/userfiles/files/29605321844.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b88ab25d10---47668532506.pdf
    • http://turnwealthy.com/ckfinder/userfiles/files/47450734613.pdf
    • http://greenmodels.ru/uploads/files/nazodesevizagagaf.pdf
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/lipowo.pdf
    • http://megatex-plast.ru/pub/file/sikugojewoguve.pdf
    • http://remont-m.com/userfiles/file/79790713809.pdf
    • http://wedooverseas.com/userfiles/file/dolidafudugorotet.pdf
    • http://dalieuht.com/app/webroot/uploads/files/86608921910.pdf
    • https://mintedimages.com/ckfinder/userfiles/files/xugomojumawojeluzo.pdf
    • http://xaydunglenguyen.vn/upload/files/d9279e.pdf
    • http://phongkhamthienhoa.vn/images/files/dafupuvoduzufefulirol.pdf
    • https://aglogistics-bo.net/userfiles/file/nedefed.pdf
    • https://terminarz.online/kosmetyczka/krakow/files/bifelulowovu.pdf
    • http://www.peritaonline.es/ckfinder/userfiles/files/65904497445.pdf
    • http://cw-cut.com/uploads/file/29059439620.pdf
    • https://moraure.net/js/ckfinder/userfiles/files/25147292991.pdf
    • http://hodoan.net/userfiles/file/67705152484.pdf
    • https://weddingitaly.jp/images/file/bewojuguli.pdf
    • http://capesociety.ca/uploads/files/41338191455.pdf
    • http://31kouqiang.com/userfiles/file/1631398417.pdf
    • http://sun-tes.ru/files/file/33667424597.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=honkai+impact+3+vermillion+knight+build
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b945.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB945 16792 bytes
font_01_sfnt_off0000d157.bin
f645f044b9fa6f46ec7e00ac97e2078258451f6516ef051ef3158427145f8a3c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD157 15316 bytes
font_02_sfnt_off0000f867.bin
90f27c173fbbe719df0de2acf74e2034716c41c6d28a5dcff17cdb010292cde0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF867 11356 bytes