Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bfa01a91bd1c9b6…

MALICIOUS

PDF

92.2 KB Created: 2021-07-03 15:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8934f591b2732f42626fa9554196389e SHA-1: cd1803b3bf1dce0a23bd7eefcec1dd44e1180370 SHA-256: 8bfa01a91bd1c9b635875e549697bcb3f3cb4ef8aa336ab3f5b7f86dad54fd5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://csom.cz/wp-content/plugins/super-forms/uploads/php/files/051bb09ed004ed11eb3387946eb463b2/50174427219.pdf In PDF document text
    • http://learnazia.com/fck/imagesfile/63562329383.pdfIn PDF document text
    • https://kund-in.com/userfiles/file/7074983006.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/c16bf55094b0fd8bb27148a4e385b9b1/91295146645.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607581c7b866b---fuzekoxoxizorap.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d29b4072a5c---dedosademijodamizebasujim.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/3798834488.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/54808349343.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/wudidakadibomika.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/oubgcefcvq4qom3krcgg50k1dv/95375395224.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210524192805559.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/kunabiga.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088243dad376---72972600938.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0ae5e4dca---15218001666.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/wefumidaxovuzos.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/95881501740.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd2a717c3e---lobosawepo.pdfIn PDF document text
    • https://mmszke.hu/files/file/varadugedupuvojuvar.pdfIn PDF document text
    • https://slide-bearing.com/d/files/bobitigubizi.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/86449461816.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/adc90e2346c7cfe269cc71a015c27628/28026717349.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076826d5a722---kavubagagulixaj.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/rebepufutora.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095de6f36547---begazeder.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/9003674e259694069aba756a8c9699d6/92089149402.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=multiple+choice+funny+quiz+questionsPDF 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_off00010418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10418 17748 bytes
SHA-256: b87d6ebe721e29aa38b1100e3fd06fbd37a505c2a8df6ecc5506ad4f43bbc281
font_01_sfnt_off000132a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AB9 10728 bytes
SHA-256: b1a15adfd913188c1e657235ae7213f7b0320f05e0254aad4bf3e277980e0db1

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