Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8cce44bf5b47297…

MALICIOUS

PDF

80.4 KB Created: 2021-07-30 16:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a41e4e751b0d1ca25c1d2eb893443c55 SHA-1: 14b6ae8eef704765d8bc4f890aafdd19e251e252 SHA-256: a8cce44bf5b47297031bef7d54f98c6e7f8f995f8cac9e9389facd0dec7e4b83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, pointing to numerous compromised or disposable hosting sites, likely for SEO manipulation or to host further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1608d45fca3f1e---322178776.pdf In PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/javifelatozuleduke.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16079daa78e8a8---dozev.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/rusames.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/91816456204.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/eeb2a48810c35de7c0913f9e6ebf68fb/62782200897.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/sewuloz.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/91656269409.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/97606604654.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/xurefitenafofop.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/pugufitekujuwexaselone.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5187de121c---23622448064.pdfIn PDF document text
    • https://claudiodituri.it/uploads/480247648.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/851a2d61fd9abb25e0956e670788e9f3/taterirer.pdfIn PDF document text
    • http://mwcapital.net//ckfinder/userfiles/files/pejitewisitirizadenalegi.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/34692580056.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160acf358c1b49---56247688007.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/q1c2f2co2uotloiilljvn29ud4/toxebazitaxuritexiv.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e786da8cb2---zuvavumikakoregifiko.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/sjb4dfrfhr68j4cl0ih38cnrl7/54414582402.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16087480b47202---26116530496.pdfIn PDF document text
    • http://bwc.lt/i/73732762032.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/d32fbbeb877abb3186d84d0c18abd79b/62248989029.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16082c63fa7579---5969922427.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/64871944858.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/sqq4a9scsqf0u1v05t9ce36bvi/33563905755.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+clean+respironics+nebulizerPDF 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_off0000d609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD609 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE20 10744 bytes
SHA-256: 674c5365360bb4ceda568bd7bf934a69e8cd69fd2502bbcd8abd54626178ef38
font_02_sfnt_off000106c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C4 16620 bytes
SHA-256: 29a84eae513e86bd50e8d732aea24ab2664877d34eeb0b3b3643a20ec4bf291f

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