Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dbe017759728f3c…

MALICIOUS

PDF

71.7 KB Created: 2021-06-22 22:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 08277c7093fb06e7ba02550264745556 SHA-1: e40c61a301be0d29987c3e95d36e18a976009f09 SHA-256: 7dbe017759728f3c45e1f0781f5ea61bad8644dbdbe37a5567a70fe5121aff82
164 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a link farm designed to redirect users to various external websites, some hosted on compromised CMS platforms. The document body, though heavily obfuscated, appears to be a lure related to an Arabic dictionary, likely to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://krisoc.ru/uplcv?utm_term=arabic+dictionary+hans+wehr+pdf PDF link annotation
    • http://veterinariomauracotti.it/userfiles/files/41244251531.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5c1e5e554---10096288038.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/80577135976.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/27679686089.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/pezodofebufuruzetoxawo.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/43613285068.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/90592426802.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/xolar.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/49939924902.pdfIn PDF document text
    • http://artside.org/data/temp/file/sobonuxumesuwekit.pdfIn PDF document text
    • http://ks-puyuma.com/CKEdit/upload/files/95324963792.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/shqc5r48v4ofj76edulhcv9cjq/63243618421.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/37fc4815b5e2a440263f03725427ad22/bapil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD853 5532 bytes
SHA-256: 6b9910333313fc8019620345a378d339a45a30293534e4c7a41adb034123d8cc
font_01_sfnt_off0000eb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2B 11780 bytes
SHA-256: d87421f89ee10df0509c081ff32d7c36396814a9259335869e1128706e6adbb6

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