Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d3e02491d0ea38…

MALICIOUS

PDF

94.1 KB Created: 2021-09-02 11:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 933e2764430e18b621efff3598a52e8b SHA-1: b5d89210f6aefbefce99e31c558b07096b6f7c3f SHA-256: 05d3e02491d0ea38a6ba1ef6d988f3c407c0e107445ac7b3b975fa839d110d7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 http://arisutour.com/ckupload/files/70361085676.pdf In PDF document text
    • https://sambelteri.com/contents//files/14678751153.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/jexovamuzoropidovefidusi.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb9e6c8e3f---japubanigagemudupatanav.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161243879cf289---wibasukimoxixomiwofanax.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608048a334893---81749163049.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/vivatimajogu.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/85348124677.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/1498690000.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/sakadela.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/nenalo.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff8a92a28f---82577622521.pdfIn PDF document text
    • https://qnzar.com/files/bodabefutajidajuw.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/37688839209.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210828012216.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/zoxafomojobelo.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a288b74e5dd---20525921256.pdfIn PDF document text
    • https://people11people.com/uploads/File/47008202988.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/rapujif.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/71923653200.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/31276905043.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/0pd990j1hqnh31n8d74i6em5b2/fopixamidab.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0398d87257---lovoxijebazefanipudubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=simple+hacking+tricks+pdfPDF 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_off000104fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FE 19960 bytes
SHA-256: 697f0171db05f8aead269e186dd5b9afd2eb222583c9d01234fe885736e6b850
font_01_sfnt_off0001395c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1395C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15173 11112 bytes
SHA-256: fdc1c3f4114541b85dc949deb70df4145e1253bc4dd16bf3912e794a249e6831