Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fb339bfb8a94df8…

MALICIOUS

PDF

86.7 KB Created: 2021-07-06 21:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: caae2ebd9b6283a2ee33452c78e2e91b SHA-1: 835be7dbcfc1692df9b4699ce0524516b7f63b78 SHA-256: 3fb339bfb8a94df8dffd729057f5b7d2bce9063d42cd5fba74cb5ca2939161a8
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common tactic for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. The file's purpose is to lure users to these external links, likely for credential harvesting or further infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/35f308cd6a5b81765caff637c9f83939/pevewunow.pdf In PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/iso6eh4ij67fb89r38ri8un4ks/mebamibumimiwegaleta.pdfIn PDF document text
    • http://iworking.vn/uploads/files/jodivafogidazerupam.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/17732faec856f67e6f9b9b58e3433aa8/65611677117.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b35b5ed5f62---ganorufarolefufamepel.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081810ad1d81---88012601665.pdfIn PDF document text
    • http://aquatherm-graz.at/files/52304680500.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/89901378674.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/7bab0309e6bcf4040473c754dc2dd0fe/jabiparabaladiw.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a01a95403f5---3682185835.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/tnmbrsu85jto5ridpshtp1lbdg/wesefomopawero.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b611149f5---labavalefomode.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/kawepuzusubudibovol.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/79049277336.pdfIn PDF document text
    • http://axwelindia.com/uploads/52350444640.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/wibuzokixumej.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4c92c1eb3---29965485225.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/dodukamimi.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/fabuseruruzinadux.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/diwivisurubovit.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/56038248680.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=thermal+conductivity+of+metalsPDF 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_off0000ed09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED09 10984 bytes
SHA-256: e607771cf90024d086d946854a1d0150ccac486a09d478899a109b8daa0363b9
font_01_sfnt_off00010660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10660 18020 bytes
SHA-256: 4088731f034b2efa356741a0752ee9c154c51eb552c695faf57702247f1af0d2
font_02_sfnt_off000135b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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