Malicious PDF — malware analysis report

Static analysis result for SHA-256 f220421d50634e08…

MALICIOUS

PDF

79.4 KB Created: 2021-09-13 21:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1aac79d24560485120c9d84c98a2d448 SHA-1: d9b4b77ba03ad9fe385ed06e53d4f08c61a36c10 SHA-256: f220421d50634e08786e87275c2232a771836f398c06896213d0d760ef389479
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious payloads or redirecting users to malicious websites. Several heuristics indicate the presence of a link farm pointing to compromised WordPress sites, suggesting an attempt to host or distribute malicious content. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/2ca05a2320e889219e22b9c92a2b39dc/63788003980.pdf In PDF document text
    • http://clingac.es/d/files/9605190864.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/9727962931.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/80525232425.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/sufuzifadalapexesutagifuk.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/sesefitofawitilazisarel.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/mikumivaxunoxofevirowuv.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/lumawaxodiwaxogumiwilula.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/16382470429.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/bufaresiw.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/ce2a562d5ded1b9ff030f479df756a3b/xozibasogefarizileluzo.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/vunoki.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/jajopaje.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/judifipumelevuw.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/9v0c9t2nluitnelrf1poo091mm/sasuwezede.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/68447284987.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/52079804473.pdfIn PDF document text
    • http://wdnederland.nl/file/7518837688.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/mivonafojedel.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dalabenuto.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210901023525.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210905_F6450512998C063A.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=vidmate+original+oldPDF 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_off0000d4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC5 10392 bytes
SHA-256: acb349fb20e21992c9016b9176836c5537bb8ecd8aa25ec4e09a0519719302e6
font_02_sfnt_off000103ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FF 16928 bytes
SHA-256: 7fd5af6167774d9df9f026988855d99d728d855882ae9208ca75e1d95c0d5ca7

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