Malicious PDF — malware analysis report

Static analysis result for SHA-256 64ff905b0c106d67…

MALICIOUS

PDF

69.8 KB Created: 2021-09-19 23:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 28d7e43d1078638e8f9cddd17c8f4b39 SHA-1: 5e42e65a889a3f7d101e5810e6cfe6dd5a689ec8 SHA-256: 64ff905b0c106d674cdcef812c4f922ba5fc94474a1c34480a783cf541db2adf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malware or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the nature of the URLs and the PDF structure align with techniques used to lure users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://reviewz.eu/app/webroot/files/userfiles/files/kesaganudebukiz.pdf In PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/70562420669.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/68852279906.pdfIn PDF document text
    • http://dpengineers.info/admin/userfiles/file/77799245955.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/92659492673.pdfIn PDF document text
    • https://tipresentoio.it/images/file/mogos.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/nitujetala.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/momadejagudedonijatunapiv.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/muvigirigovetexatupu.pdfIn PDF document text
    • http://peoplefoster.com/pliki/65310840517.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/19b7897001e162614f9fbb95c18052b6/sexuvedakopulaso.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/potumoxamipelilo.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140bd6ab0793---giminuk.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ec7d76c7f---70302477957.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/50893712413.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/71331281415.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27529432162.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/danewebukinibemitifarabo.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613717da065f3---74576159547.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e65952d5d---92571694193.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/41939186213.pdfIn PDF document text
    • https://kildevangen.dk/files/11025076722.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/r93j5kn5l7r8moh9nmrbjgde89/zepatab.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/duzewujezujakarijenu.pdfIn PDF document text
    • http://dytac.hk/userfiles/9050122579.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=hello+neighbor+2+android+downloadPDF 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_off0000b5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5AA 10600 bytes
SHA-256: dddaa9738ec10db81ef776194ebcd8075a23489ebc4d75fc913dde448b680540
font_01_sfnt_off0000cd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD93 14280 bytes
SHA-256: cece7ed0b5bcc13c1bbe30b3b444210727276bc724d1b2c740a2b3ad29256c02
font_02_sfnt_off0000f108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF108 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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