Malicious PDF — malware analysis report

Static analysis result for SHA-256 e99a36a9060a05ba…

MALICIOUS

PDF

82.9 KB Created: 2021-09-10 18:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5516fa86b2961a0ca8bfe2c1ca8f36ac SHA-1: cf3e33969e1c04bd7c6c39196b39f5430e53752f SHA-256: e99a36a9060a05bac0fc80f92834dca778db1c99d28594a4c72ab06a3cb68cad
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised or disposable hosting. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates a pattern of using compromised WordPress sites for hosting malicious content. The embedded JavaScript likely facilitates the redirection to these malicious sites, serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://andrejc.si/files/file/2896805142.pdf In PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/15634636210.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/fetifarabobi.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c1e2ace32---pevidozis.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/duzogoxigoredujoxirep.pdfIn PDF document text
    • https://ibextrail.com/editor-images/biwobitumerolunomaban.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/67876818571.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/61783281230.pdfIn PDF document text
    • https://seikai.jp/free_images/files/75297913862.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/17744059899.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16130cd73ccae8---sulefugapurologafe.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/34131705964.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/59898014227.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f29ea61b3---vifefalisofo.pdfIn PDF document text
    • http://a899.net/userfiles/file/38512863781.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/tuxaburuvagof.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/60294332348.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/0f927854c0e9716e5dee5affb61ac695/gifunogawegusodabiperug.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/momezilobugute.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/64505157676.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/wukituk.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/2109010756117634683u36m.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/doxeti.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/10851180438.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109040759231835.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+do+i+transfer+my+contacts+to+another+phonePDF 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_off0000dce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F2 18148 bytes
SHA-256: 7f27afed32aad6d888115b564206cdb63b630a111e3d8b9270bfdcf0c522693d
font_02_sfnt_off0001239d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239D 11028 bytes
SHA-256: 0f28cab43d7de2b56e76a0eb744150c2c4005945179c6856d93ab4900564d7c8