Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3a4da874db8fc1…

MALICIOUS

PDF

74.3 KB Created: 2021-09-19 17:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6fd30d7ba1e23ee39aab94d83d35162c SHA-1: c2a64d7106a1120b1ec9ff9607a3f09f248fae96 SHA-256: 8d3a4da874db8fc1ec9c8cefd620e0dc29834194e8533f75a626341a5cb96390
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • 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://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16133214b526c8---78575617495.pdf In PDF document text
    • http://mofrantech.com/userfiles/file/21898141349.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/80953013674.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130af974d82f---xiramuromunokufosa.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/7676982522.pdfIn PDF document text
    • http://odumakus.com/uploads/files/71405570814.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/vozirifikutefononuvugunan.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16144743491b76---37730197544.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/tudururibiwofowovumoma.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/6368934657.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/ritajazurami.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614134126146f---dagipubejibofujenetetor.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/dedafolop.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/11478824399.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/54618314819.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/82261584464.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/vebojanetositu.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7fdbb19b1---93127626650.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/lenitewujagi.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139cb705fbe3---43577141370.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/49384325898.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/jitisonanozolalotu.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/37904198560.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/161340a855f345---xetepuwuweko.pdfIn PDF document text
    • http://apvn.info/userfiles/file/70447672490.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=frayer+model+template+for+vocabulary+wordsPDF 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_off0000bfb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB0 16624 bytes
SHA-256: 4c40b4dfdf2df7ece3d2a73b5e5cf75c5e43127af7c79038dc93bf58154ecdaa
font_01_sfnt_off0000ea01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA01 11068 bytes
SHA-256: a930cc73bdc86ad317ac2155df2602bafb366ec7b03c29bc7d5ab505af61952e
font_02_sfnt_off000103b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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