Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad809fe322af3a7a…

MALICIOUS

PDF

71.3 KB Created: 2021-09-25 12:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7aadc18bbf388fc4d9664f01ac25ab88 SHA-1: 4d7e3de60c6b3dbda2efd41ad8a2642a7d85dc27 SHA-256: ad809fe322af3a7a41fb488168587c4844557b946c802921f0506640c472bab1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133414e57a91---2304135208.pdf In PDF document text
    • https://sfeerweter.nl/userfiles/files/64191811895.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/20413559665.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/bogamapabenuwamor.pdfIn PDF document text
    • https://denimder.org/resimler/files/86075458464.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/piguvid.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/tanemunekewuxijanudesipi.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/52422896633.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109140847107747.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/gh1r1hd1b4kji0hdafi0imipu4/lunupuron.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/88591986795.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/30a5fecaefa1ceb03e861c8e507fedea/foxisudelupugurox.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/wefidetenan.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/99061868265.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/83qquiu5fh945v5ultvb0kdfi7/luseki.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420b1506d82---ralawemudugelugus.pdfIn PDF document text
    • https://oldgradeducation.com/ckfinder/userfiles/files/xotudiwafopew.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/57588019579.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/bonilibuvomafafabe.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/11819874114.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/79571406541.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/wuvowe.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/rikix.pdfIn PDF document text
    • http://xueyuan.zlyxgw.com/uploads/ckeditor/files/20210921005852.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/83300191388.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/tipuledoboxowozojazusom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=co+op+games+ios+and+androidPDF 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_off0000b627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB627 10624 bytes
SHA-256: 62276bcf918c2d09f5cc2987f50230f7c13928fac5736f91be512a753c652839
font_01_sfnt_off0000ce2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2E 16272 bytes
SHA-256: 8758bbbce8204d24a5f03b582d45a7c95009d6a726780c84bb8b2dda4c057c17
font_02_sfnt_off0000f713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF713 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1