Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac71098884c79c4c…

MALICIOUS

PDF

77.9 KB Created: 2021-08-08 15:41:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8fb35f5425126538fe4236a0fa417ae9 SHA-1: ba798bcbec3fa9fbe4161a978353b8bf4ae1d416 SHA-256: ac71098884c79c4cfc6d7b70cd37bc6c17f81b516e55566d79a5a11731fbf402
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to disposable hosting domains, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially compromised or malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://nktrading.qa/file/files/gagizipotuwogi.pdf In PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/poromoremo.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/687de306e04526bdffddeda904f93233/woditaxanemanusavoga.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/nawejazigirekobulid.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/bavapilesixow.pdfIn PDF document text
    • http://liyangah.com/Upload/file/kipexetusevek.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/papesubaxarunojejidedem.pdfIn PDF document text
    • http://beadsandsupplies.com/images/file/30773873004.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/tamapojonavapixa.pdfIn PDF document text
    • http://dymenahealthcare.com//upload/fckeditor/file/73016390771.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e05362f9b---viwaratejasezaruwoxubosal.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/70446241967.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/olbhgcdo4ak56n4k0lt1m5nj93/faxowatevebugedaxovegebax.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/nuwibigulu.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b700214cf53---gavufal.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/c8350c98cbb9d7cab9917c6aa8b78706/xovubakitubupoferedosigo.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/73288701306.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/nikoxexikebinu.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/nameweriginomum.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/74a0e543b32bdf39ce80b692e1ca7fa4/ripanizuges.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/70644356128.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=saxon+math+8%2F7+pdf+download+freePDF 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_off0000ccdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDB 16684 bytes
SHA-256: dd8e1825d45969b1229c831c6949864d2dd3a4c5616a5cb2f739e7eed4e81e82
font_01_sfnt_off0000f809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF809 11060 bytes
SHA-256: 39d74217c919c78df88cbab4f367692eaa4fe8bacf22bc8f1df1ca381c19e34e
font_02_sfnt_off000111c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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