Malicious PDF — malware analysis report

Static analysis result for SHA-256 dda2d501109490a0…

MALICIOUS

PDF

71.3 KB Created: 2021-09-17 00:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c5fa90d5db5ed7225608bdf1fd7f7044 SHA-1: 3aa45a97f70cdbe5a5b5eb4c5d3c5c7f1c989e50 SHA-256: dda2d501109490a0780bfeab74996f58c6f0c306975b41048091c65403eecaee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure, likely leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://detectiveoffice.net/userfiles/file/rafifatosejer.pdf In PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd6f907044---79927788893.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/96186904380.pdfIn PDF document text
    • https://asi-filter.pl/files/file/laxedinuje.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/zakopijexopagigivi.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/riwubijisudakezara.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311e24e6d01---manogapux.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/gesanomin.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613987b77d834---pagulatida.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/76366194978.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/73117010168.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/mivovidulusatarobizo.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210917050223.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/96431974847.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/23707849644.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16131c98b86280---33386554438.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/rajipipon.pdfIn PDF document text
    • https://tuinvandecruys.be/file/jaduvonuzaxiwaxaket.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/ginizefuraxokedorovi.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/govujomevikinuzojewaresi.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/14974737016.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/fofaxinenibozavu.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/161300e9949edc---wuvikuxuvoridumolusugi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=free+vpn+apk+download+2021PDF 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_off0000b841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB841 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD058 10540 bytes
SHA-256: 9972ba9102b41beba4fd17b90e3b4db21ac39d2656b989c757c16bfd08a14620
font_02_sfnt_off0000e884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE884 15432 bytes
SHA-256: 011597b2a152da53fb9b006466831b911772bea02fddcebe5d6bb5dd98e0e964

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