Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f1dbeef3b079548…

MALICIOUS

PDF

115.8 KB Created: 2021-08-15 06:34:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a96b4690eb872d7c4f0e1f04a8c4e94c SHA-1: d2ab7c6e76661b24d2a06fbaf2d56b06da326f2b SHA-256: 6f1dbeef3b0795487f16e0c150cc94a57d589ab5e7fefc4d3d1215ba83dfbfca
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and a raw IP address further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://maysoi.com/hinhanh_fckeditor/file/goraxagekixupipaf.pdf In PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/7fvrh1cqqi0dkb48ns63thejb6/gujoxuriwudelukami.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a260b1ff0---38957479871.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/49914845101.pdfIn PDF document text
    • http://minerva-collection.net/files/files/wokipusuwigozaxezev.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/35738436487.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fazasurasogofixila.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/29355567283.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/46064775850.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/99943420640.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/42089223372.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d39c883ad04---sovofokomo.pdfIn PDF document text
    • http://mayamalay.com/clients/874202/File/59279860602.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/76234766936.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/lulofidiwew.pdfIn PDF document text
    • https://avela.md/userfiles/file/lovidafunivawuv.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/gpjeo35s7u9kmjla8ier1r8teh/luwafidusan.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/d8uk67lplccvn04jslehdmc4gn/40825096977.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924ea035ef2---fejomupevisesenasawoxol.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b10c18161a5---dekawopufulog.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/cc2ac17e071ddc792305aae55a9118ca/2312338067.pdfIn PDF document text
    • http://bkbflooringusa.com/userfile/abbey/file/zelajizu.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/baxulot.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e90e75ed2de---fuvagapidirokij.pdfIn PDF document text
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/15442213516.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c95c18a00---90823131205.pdfPDF link annotation
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=onan+4000+generator+parts+manualPDF 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_off000160e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160E3 17664 bytes
SHA-256: 19c77322975140b566f0919b9eb1036e5e3c7b955fca9a028a3a12bf79ac14a7
font_01_sfnt_off00018f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F93 10828 bytes
SHA-256: 427491b81c665e60ca17cd0f3956b108f838e14a93cbf3982031f8aad51caed6
font_02_sfnt_off0001a89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A89E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1