Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a487a0558b71da…

MALICIOUS

PDF

71.7 KB Created: 2021-09-17 08:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 328e4a1de0d57bdd088f3b68f5a22341 SHA-1: 9784909bbb4858b3a4ff38dfd224553dc8a6cd06 SHA-256: 16a487a0558b71da0b9ae8ba384fb84c400ea01d9ec850ff399ce98d8713dfc4
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains embedded JavaScript, which is often used to initiate malicious actions. The presence of multiple external links, including those pointing to compromised WordPress sites and a URL with a 'download manager' term, suggests an attempt to trick the user into downloading a secondary payload. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pixomot.ru/uplcv?utm_term=internet+download+manager+6.35 PDF link annotation
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/0e33e631a394e85c72b451314937b5c1/37680288078.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303ed90f3e3---jemidoridimuku.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/wuxakevodeludebed.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9308185103.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/betakobuvopavu.pdfIn PDF document text
    • http://dison.cn/filespath/files/20210913121627.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/namosawufun.pdfIn PDF document text
    • http://yanartextil.com/firma/files/bimenuporapumukosirelu.pdfIn PDF document text
    • https://izr.fr/files/69550611008.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/47400175541.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/ditovaxijo.pdfIn PDF document text
    • https://frisch.ro/files/file/kanivapinawafejevepon.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/86168113356.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/daxidozetekitejero.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/16918432932.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/mavezef.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142050e0fd31---36254340240.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/fovatutubagovuvuxo.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/28609875376.pdfIn PDF document text
    • https://ottopianos.nl/files/govupobag.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/weliz.pdfIn PDF document text
    • https://bnovum.hu/downloads/xevit.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/duxakileguwowegefin.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/tabizazotasogujumuzavove.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/f07f11395a6dc65f8d2f928bd0781772/43439795642.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_off0000b615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB615 10908 bytes
SHA-256: ebc7763c4a3348f2603d47a79c292c8c6147ff67927ab8716884f1aadd3b57e1
font_01_sfnt_off0000cf3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE750 16476 bytes
SHA-256: 5044708c46ec421fd7084a5ad1888c19b83fb5bf059d2d840ffb27ff1bc9556f

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