Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ef8bffd2c51069c…

MALICIOUS

PDF

86.2 KB Created: 2021-06-26 21:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: af85ba42562d4c63cb98b35387afaa0b SHA-1: 635f798b4fc0f0146cfbf70f998afe0f31764e56 SHA-256: 1ef8bffd2c51069c2409833e1a1e12a3e67b1ed0adf0da64c8542f563ff10059
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or redirect them to malicious content. No scripts were extracted, and the document body was unreadable, limiting the analysis to the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nhahangbienhaitien.com/uploads/files/fibadokovaxuzaredeguw.pdf In PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c51c09ef313---wufige.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/6072831851.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/67711657835.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/d1acf5cd9f9c598dfbcd4485fe9eaa49/zimifinezipavinurupe.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dff1964b95---zefurifir.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6684f21d83---78417566644.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a749d87bc67---towafidowerixavewepese.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e0bc43273---fonuzadusavekisunugexin.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/galarenajumuwiwoseterij.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaac7cce60---48185670200.pdfIn PDF document text
    • http://klpa.net/userData/board/file/81242443181.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/7t07bjjgl405d156nass5t1dvo/71546442089.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/taxogogisoberigivomif.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/3c066fcbb1d9eaecfcc7479ebc8803a2/xemarajivom.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92d565fc3e---delizumodovositijapaga.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/50347017500.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/73fe747f5d088625babe0170208e0007/laxidivenedevazejekanux.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160d638e01b5f8---223353368.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/2a26e680b99df7392f45e66c167be032/59849760689.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/dawutarogoba.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/kejijezeze.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/10002990721.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749df50843c---sejaloditebabeluwudiwoke.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/57052499137.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=174+minutes+to+hoursPDF 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_off0000f0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B9 16848 bytes
SHA-256: 2b1fb97a5c43b9c53f7656d4560595be65c160e666cb0dd1b640467b3b873c92
font_01_sfnt_off00011c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C52 10348 bytes
SHA-256: 29767e38c965ffd34592bd4fb845316f06e3bf1bd14937a06e89f377a2069b7b
font_02_sfnt_off0001338f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1338F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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