Malicious PDF — malware analysis report

Static analysis result for SHA-256 29bd105d40c6845b…

MALICIOUS

PDF

83.2 KB Created: 2021-09-03 10:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2dc610dd7c659776ae333b339c924788 SHA-1: 469ef0632cc0c1efcab155abdfefbbe01c99157e SHA-256: 29bd105d40c6845b5f7cca72bcc64f732b539a408621219c97a3c6473b44abb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate that this PDF is designed to host links on potentially malicious or compromised sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72fdb3298d---nokupixogiwuzus.pdf In PDF document text
    • http://zdrowejaja.com/Upload/file/78691340498.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/79607718134.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/zorokaxomige.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/kaxodulirodubafusatu.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/kobukixefuwimafu.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905f0cc87db---8771876110.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5adbeb3ea---wofix.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/33749801214.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/12150305158.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/sipiwukeru.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/09tn43pirenk3ljsoioafcb0rg/kutaniwozilaba.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160badbb49fafd---16950675255.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/tifaluxef.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/dazizot.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210707_121514.pdfIn PDF document text
    • https://empresa-venta.hr/files/82917055784.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/powetewawazifirazudik.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e1d761b957f---burumuzuv.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/pilaloxudizewiwoze.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097e9632f504---41779117943.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/57843740166.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea04b806f0---65883090361.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/87806866495.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/f23053bc00be15b0c6d49eec36c4c95b/lapive.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=drainage+system+thesis+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_off0000ddf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF6 18372 bytes
SHA-256: 0178bf043b22b632a362652e9b2ce4e778d7cf4b1be2ff296c73fb4b48e1587f
font_01_sfnt_off00010df8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF8 10892 bytes
SHA-256: f254aeba7271b30cc8452d5d08200b11028e692a500e199d21b5fc4149bd2ec8
font_02_sfnt_off000126cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1