Malicious PDF — malware analysis report

Static analysis result for SHA-256 8322483357fbbc96…

MALICIOUS

PDF

78.9 KB Created: 2021-09-13 11:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 662c95f36cfd71d9b505a5b574741e4d SHA-1: 2966712da6110ef63a535d5fdce8432873831793 SHA-256: 8322483357fbbc9621f5b55a6788a4927b78860f28da0a8b12007c51a1cf1823
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to multiple external URLs, some hosted on compromised CMS upload storage, suggesting an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://akrmedia.no/ckfinder/userfiles/files/nepajetogopojavofazo.pdf In PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/zujanepuwema.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/dotugifegix.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/ruliruxaxopudekux.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/rijepake.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/tikopabapivapupixixip.pdfIn PDF document text
    • http://findusafranchise.com/files/files/70572578984.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddfbfa6f37---81754680432.pdfIn PDF document text
    • https://flammerouge.ch/userfiles/files/98717940071.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/16739581476.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/gewex.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/15991950453.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/wutidafaw.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e800a7926b---gisivu.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/25605194939.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/68607207663.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/6969428bf763e072a3a468027c11eb40/76160313849.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/872404578.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/1765663966.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/84824799606.pdfIn PDF document text
    • http://househouse.it/userfiles/files/wawesidomogerajikezaji.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/4927744108.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/xinedesenunos.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/58950332172.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=highway+traffic+car+racing+game+2019PDF 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_off0000d187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD187 11104 bytes
SHA-256: 177ec4b2116464544ec540957c8ea0c5f2173495e930c4c0b3d3579c2478cc3a
font_01_sfnt_off0000eb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB65 16508 bytes
SHA-256: bf4449721d93a9bb22c188a4794f8fa0cbbd09c16528373be54717d80bee2ab4
font_02_sfnt_off000115e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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