Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cf246c0c03100d8…

MALICIOUS

PDF

82.6 KB Created: 2021-09-22 18:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a1164afa4ed9e6a52399089ee28d6afc SHA-1: 468bd071c36c3a77d5e645508f04747b652d1897 SHA-256: 2cf246c0c03100d88cf8cbba022eeef24656d7278dbecee0cbc40a8bd0063cf4
104 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the exploitation of vulnerabilities or the download of additional payloads, while the link farm serves as a lure to direct users to malicious content hosted on compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pixomot.ru/uplcv?utm_term=celebrating+men%27s+day PDF link annotation
    • http://annamsaigonlaw.com/upload/files/84835458679.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109041210171824.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/18086838962.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/09/file/202109141156007190.pdfIn PDF document text
    • http://wingtsunkungfu.ro/imagini_ws/75080428776.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/84315861305.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/53976630566.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/47795590614.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/239014910.pdfIn PDF document text
    • http://velo.hu/UserFiles/file/vewekivasowemaso.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132c6197305a---pidarategabu.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/dasukuba.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/46644978244.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/87f648b16ef0a1b60d35cc631d25713d/40554681238.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/gupapusip.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/gexanifepasetemer.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/84319027213.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dada240911---14621663176.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/xudefoxesufiz.pdfIn PDF document text
    • http://ashioke.com/images/library/File/pufitikizofujovusaj.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/31027800744.pdfIn PDF document text
    • http://888chji.com/userfiles/files/lutizuvopezuluvubopo.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/pomarujeg.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/4760539603.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/dejiguxa.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_off0000dcb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CC 10788 bytes
SHA-256: 0eec71912e1ba73c6c0d0468ab2d04361ac494e3c00d3ee45bfa797c85698b72
font_02_sfnt_off00010d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7B 18144 bytes
SHA-256: 067feb06ff869b069608e0356a69c2b1fd5b5a920714f21b2924856c822b63d2