Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc1b2e90141e3cd1…

MALICIOUS

PDF

79.0 KB Created: 2021-09-05 05:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8f8a71551d06410469fb29759d4ab2c6 SHA-1: 77045eb3b4b65c0c8d06ab573a5f2a4e50e30773 SHA-256: dc1b2e90141e3cd1a0d5d269320eb7418da68b720679b4416e8e301ececeb994
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608727349653f---98317260446.pdf In PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/ff6dc7ef583c7384739b805c9ead8971/46848576853.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/dedogenetu.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/7cb0179e0afaef79fe133aa553244b69/46887705203.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/66253602561.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/71688810280.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/veludarenafepapozopolip.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/79442382802.pdfIn PDF document text
    • http://elite-weekend.com/clients/9/94/945a7f92a07ecc721aac768ad340748a/File/zilotamudabamuxidot.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5f400664e---wakunuboluripajanufobej.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/xixidezevasafokatenoz.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d29d43c0b---fififutumukujujagivesado.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/ronap.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/1fc8091ac7cf671cada70fc73a005c3f/65974609974.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/78098299027.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/39792417786.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb88c0c14a---bumiwalobofederegagare.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/k2m868h2e85r8nb5ojis9oima0/pavidewu.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/78749008581.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609badcfd5a99---pefaf.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160782b07e92e9---24738089720.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/1dduq0g4m92hrp4qoluriftvv3/fexukupadukujigefobonugo.pdfIn PDF document text
    • http://dogable.de/userfiles/file/jiregipufavuti.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/salolezifokoralaxefogi.pdfIn PDF document text
    • http://westboroughhigh76.com/clients/b/bc/bc4984db1d461a603911d7e4814e3e59/File/80051689116.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a52b0a519a---99313743629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=free+convert+pdf+to+ms+word+filePDF 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_off0000d171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD171 17216 bytes
SHA-256: 881ee2b83f11b4446ef10a93416a126a8c7dcf3bc25db5587bf7cd608cc702ef
font_01_sfnt_off0000fdb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CC 10748 bytes
SHA-256: a9e8774af4bb45bd1d2e5ffc7c00219aba8ffd5769b24361ee4715b604825d75