Malicious PDF — malware analysis report

Static analysis result for SHA-256 16228ed86ec3b292…

MALICIOUS

PDF

83.0 KB Created: 2021-09-13 07:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f43501a7217ad80259ddc1963769b252 SHA-1: 7ac2a8aea48dc14850c6c789da38bea89056abd4 SHA-256: 16228ed86ec3b2927ed22325994ca600cd5cd42b0d360483641c62bef64fb648
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which are identified as link farms on disposable or compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The presence of embedded JavaScript suggests an attempt to further exploit the user's browser or system.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://nyig.com/files/file/32374349807.pdf In PDF document text
    • http://diskacme.dk/images/upload/file/143764735.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/gufabelabepe.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6e9078721---latawix.pdfIn PDF document text
    • http://18554080.com/userfiles/file/mamakumiguwewasipuwu.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/58783854191.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/zokodukujikepepu.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/zubizavefovofokoz.pdfIn PDF document text
    • https://matrixx.lu/images/9435283959.pdfIn PDF document text
    • https://wita.lt/images/files/pozakuf.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/xenapegojefarobasim.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/54442370805.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/dolotunoxasexovutedi.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/8242305629.pdfIn PDF document text
    • http://sangsangins.com/upload/upload/file/wemojovixakavemifiwe.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/dalorinotolusosa.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/vegugululuwipepabofu.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/durunozumujiga.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135570d4286e---89918495567.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/woperuxijusikunopabuves.pdfIn PDF document text
    • http://vevo.keresztessyoptika.hu/elemek/file/biguwixelofer.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/vn4gcusdrn4a0f3aujje7d80l0/86819413530.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/84708784403.pdfIn PDF document text
    • http://eventpro-kontraktorpameran.com/uploaded/files/xuwaxalidelamuwa.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/segukag.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/17447821896.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/76870771231.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=best+comedies+2021PDF 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_off0000de53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE53 10468 bytes
SHA-256: ab3372991ed5ff466b7f4e946e05c9ce3adcf3d3a7fd0366b62ae61b0a5d3e6b
font_01_sfnt_off0000f63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63A 18568 bytes
SHA-256: 79f94018ce443174e126e293062c97cc2e0ff3965f488c08d8dd10769dbbde61
font_02_sfnt_off00012675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12675 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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