Malicious PDF — malware analysis report

Static analysis result for SHA-256 db71375e01898243…

MALICIOUS

PDF

80.8 KB Created: 2021-09-23 21:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ce12b6598f678a057e9c3257fa1ebd83 SHA-1: 68df2819fbf3f8d5d280311f2d3452d654928760 SHA-256: db71375e0189824316e1271275e79d4642c44c76f4cdf5934dd955834313bbf1
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Harvest Credentials

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a credential harvesting lure. The embedded JavaScript and numerous external links, many pointing to compromised or disposable hosting, suggest an attempt to redirect users to phishing pages. The heuristic 'SE_MFA_LURE' strongly indicates the document's intent is to trick users into approving MFA requests or entering one-time codes, consistent with stealing session tokens or credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161328eb44559e---91854798165.pdf In PDF document text
    • http://paulgraphics.paulsfashion.in/files/wafirovifo.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/53347919038.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c63bd80a5---kobagu.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/lusozazenamejofuzojilopaf.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1631357526.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/95ea80d6d531b513623fc23acc69cc13/92758935341.pdfIn PDF document text
    • http://zlato-eu.cz/upload/files/52920724452.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/darexofitonixe.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/21315230359.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/64267565025.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/72897716573.pdfIn PDF document text
    • http://hoachattn.com/image/files/95398620074.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/gidukebavafix.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/70892999318.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/17690643436.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/dakuganuzawowixumomonitan.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/xukivu.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135738947b79---90705810495.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/73985865082.pdfIn PDF document text
    • http://midel.me/userfiles/file/64728505348.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/febasovulegaguru.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/dolulalagibos.pdfIn PDF document text
    • https://clove7.com/userfiles/file/rizubotero.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=vankyo+tablet+hard+resetPDF 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_off0000d7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B4 10568 bytes
SHA-256: fd271d9bd843baab338d80cc8362240b50ef061feac8f0eacaad99f86330694f
font_01_sfnt_off0000efda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EC 17520 bytes
SHA-256: 0f686288afbdf8402fe09d97fc93142f594390ce5ed47ae634e6152bb97a90a4

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