Malicious PDF — malware analysis report

Static analysis result for SHA-256 404182a42d86cd87…

MALICIOUS

PDF

117.0 KB Created: 2021-08-05 14:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 61db3c7537440f249dfcb199a7c70c92 SHA-1: 78ad484f1936125b54eafddd29d2ccf5c417671b SHA-256: 404182a42d86cd87fcc897ebebe92fa6f667bdd5c88c665bb93df7daaf29b8ee
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS upload directories. This suggests the PDF is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4886

Heuristics 6

  • 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
  • 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 http://brno-skoleniridicu.cz/ckfinder/userfiles/files/15918572196.pdf In PDF document text
    • https://landbondcorten.com/attachment/file/aef0efd98414be320cff5f49199f21ff.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc18f5d2da---gebux.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/60731966738.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/16139526759.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/88641801420.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/biwedagejotag.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/nulewefoperoxosega.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160761b8aca1ab---55726402009.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/nrimmppvpn3lc723os47ols12q/8929068279.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/60512362350.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/dinugenidat.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/71202361322.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/seguto.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16085678de7e30---73133809533.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/16160501023.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/69362839559.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/032050575838.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b662e57781---jijominikawagesojap.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/69455801494.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/5q04pgnct213ihs04u3371d0m2/bapuvuzalakunaromol.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac94d7353e2---nerefupepubani.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d901f7a379---redipuwojukisute.pdfIn PDF document text
    • http://senn60reunion.com/clients/876260/File/bilovaw.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076b3e29f9ae---32311141876.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/5665c23651f26267cbd9f2b9dd0c116b/tepejijiwavetipul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=what+is+rowley%27s+last+name+in+diary+of+a+wimpy+kidPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001afb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AFB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1