Malicious PDF — malware analysis report

Static analysis result for SHA-256 17ab7ef2d92a9d0b…

MALICIOUS

PDF

81.0 KB Created: 2021-09-23 17:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: efdab5cf9219ec289e1b13d799c3605e SHA-1: a6eed82ef46e60a4fc64ebd73071fb8bbcebd672 SHA-256: 17ab7ef2d92a9d0b286747a24e4adf12ada5a48d57121df7bd816579f1647514
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised WordPress sites. The presence of a 'download button' lure and the ML classifier's high confidence score, along with ClamAV detection, strongly indicate malicious intent. The embedded JavaScript likely facilitates the download and execution of a secondary payload, contributing to the overall phishing and exploitation workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=wallpaper+4k+note+20
    • http://proximeo.com/ckfinder/userfiles/files/gazejatamuverata.pdf
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/92002239737.pdf
    • https://guapa2.com/admin/fck/file/jogajipemi.pdf
    • http://cocoabuterol.com/upload/files/50395580200.pdf
    • https://marathonlaval.com/userfiles/files/99996012044.pdf
    • http://lactopad.com/uploads/files/memaxonobotel.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/ff20d7ce89ee80f941290bb8d15c5f27/tonejuburakumotolulogufu.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/i65emkgioeiva4ufd307j2dlni/897914540.pdf
    • https://cafesca.mx/ckfinder/userfiles/files/18818145779.pdf
    • https://iamtimeshare.com/userfiles/file/6393695327.pdf
    • https://powerliteaac.com/userfiles/file/83092739809.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356dc55dbcf---wetuzafugokowizijebuz.pdf
    • http://hycxchina.com/filespath/files/20210908191547.pdf
    • http://krevue.cz/UserFiles/File/52263104397.pdf
    • http://collectifff.be/imgdb/accueil/files/suneporozukelumov.pdf
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/52940881644.pdf
    • http://mirai-kankyo.com/userfiles/files/kexapuzubenen.pdf
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/bazatonolafujaveruj.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/vobatuwomokabexepelo.pdf
    • http://kondicionery-shodnya.ru/upload_picture/file/mufubipojelofuda.pdf
    • https://mimpiindah2.com/contents/files/kopujezoguxoxulaxadebodu.pdf
    • https://0286869143.com/editor_images/files/42453418834.pdf
    • http://ugrctrani.it/userfiles/files/zeravosuwavoxoku.pdf
    • http://k-ookuma.com/js/upload/files/gawasatupazubitodogewa.pdf
    • 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_off0000d76f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD76F 16792 bytes
font_01_sfnt_off0000ef81.bin
5bddf14d50bd93bc3d041c1680aa393cedd982ddeef56a5d45419a4788237754
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF81 18076 bytes
font_02_sfnt_off00011e7c.bin
d5ca6c73b06e37b16cd58f756ac3599d7636bf57139172b7e91dc71fdb5e7ca7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7C 10388 bytes