Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8bd18bd88c5805…

MALICIOUS

PDF

81.2 KB Created: 2021-09-08 05:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e3e892a5bd300602c0db6258a549c6f6 SHA-1: fcb1a84a973cb8a8f16bcf19dbdb9ffd5e479d65 SHA-256: 5d8bd18bd88c58053db000f6eeb63b75909149ec5dc9255f5382321f344f80ad
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites, suggesting an attempt to redirect users to malicious content. The PDF's structure and link farm indicate it's part of a campaign to exploit users through compromised hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/ok2v1kb5khan3m3apef7fg5ree/futujerasugivaxopepet.pdf In PDF document text
    • http://wildpflanzen-planung.de/file/8007266637.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851a360c27a---43185985671.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071feca0e3a9---58061417431.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085bf761f159---kijapuxuxe.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092cb3b498a9---pokupigonafewobixaja.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9d3026220---33340691752.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c04dce526---99649462210.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/paviluve.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/78365371012.pdfIn PDF document text
    • http://someteme.com/archivos/_20210802090050.pdfIn PDF document text
    • http://polletnv.be/uploads/files/3640881219.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/45237307647.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/ad8a7443bce322bad93bb41b5c3ecd9e/vobeduvef.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/7fbdc7be89d4daad9e496d20f0aca778/pazadanejuxipamewov.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/26316255150.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607df93a3caf6---fikudadotexejil.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/wenesoz.pdfIn PDF document text
    • http://headrepublic.pl/images/files/morapeg.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609cacc28f730---silitor.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/mufepezig.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021052723524716.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8cedd0f5c---79369326333.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210809_CD7808FDC18AC8CE.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=encefalopatia+kernicterus+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_off0000d58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA0 18884 bytes
SHA-256: c7bb7435b4427b3a9037e7113f7cc054ef3b92d38d6062db66969a20e86e92f7
font_02_sfnt_off00011e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E99 10788 bytes
SHA-256: c451a445d17e528d8daecd6a6f7c0df109b292d14c45eaae1298094a469f9fc4

Open this report in the interactive analyzer, or submit your own file for analysis.