Malicious PDF — malware analysis report

Static analysis result for SHA-256 df7339da610fc6b8…

MALICIOUS

PDF

70.9 KB Created: 2021-09-29 02:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 21cc40208493937f0211840ec127c691 SHA-1: dc974baedc591a670af35bdd116706130ec2d505 SHA-256: df7339da610fc6b873480cba8d3b8fc41fa45190433678f910211838785337b4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also functions as a link farm, directing users to multiple compromised websites, including those hosted on WordPress upload storage and disposable hosting. These links likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=madness+combat+2+game PDF link annotation
    • http://huynhgiabaohotel.com/uploads/FCK/file/40794539103.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/dulubasuje.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614f8358dd536---15881547611.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614a2b0d9358d---wuxaguleseku.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/lapetuxojamunaw.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/36281225997.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/86489587982.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/sudilokerosejegudefi.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/mumetexesavetosiwugodi.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/61e07f7ba3c0b89e44f45fc8c61f7daa/80089332537.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/87966849939.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/37737635391.pdfIn PDF document text
    • http://wernitznigg.at/files/62755210940.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/39910705028.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/87849956002.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/xozuxuf.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/78725628043.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e9d80f2806---70290492495.pdfIn PDF document text
    • http://steinbach.casawell.tw/userfiles/file/raropasasiwaxatewu.pdfIn PDF document text
    • https://southafricapools.com/contents/files/15962736280.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/51983865249.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161324f1fb3fe8---74122554129.pdfIn PDF document text
    • http://prompol.com/media/file/tomekifujikus.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/76566145454.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_off0000b345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB345 16620 bytes
SHA-256: 84ee7632824c12578b95ca39af323dacca920d49069f78504781deb71e99ff52
font_01_sfnt_off0000dd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9C 10728 bytes
SHA-256: 11c4793c1b48ee1b9e8494459efc1379174dcfe40adbe1f51cfd7b01be2ce891
font_02_sfnt_off0000f61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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