Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c9133ef9779363c…

MALICIOUS

PDF

69.5 KB Created: 2021-09-06 04:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3f5944da515a78f3785537ab477a5ee2 SHA-1: 87c184326721fd725fa50617ed181e5ee2b3a404 SHA-256: 0c9133ef9779363c9e12787e3a2ae4d6cd63765f0a30d8f4b1b78d7858e0e8ca
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable hosting. The primary purpose appears to be directing users to malicious content or further exploitation through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://optykglowacki.pl/obrazki/files/femejirak.pdf In PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b42e986a4d2---71413752766.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/24804747755.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c89410947---sesusosobuwopupezasowale.pdfIn PDF document text
    • http://kleiberit.ru/files/file/tofawokalusom.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/s3qs4d1ducc272t593asuai8ic/71095894651.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/30212323621.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/37568830437.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/sesaxegikubobujon.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/sopesifamalusosajomet.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095db9f253eb---dumuniwawiberuxodad.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c6aed559aa8---3046123026.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/kixilolonediso.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/dosedavokegusulogut.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/50589217809.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/21164251356.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161008be89d7e0---sitakomep.pdfIn PDF document text
    • https://tcremich.lu/files/files/85594854630.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/dukumom.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/dudugatubif.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098579dcac42---8713296965.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/pefufemezizugaxeberajol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=applied+numerical+linear+algebra+demmel+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_off0000b3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FA 14512 bytes
SHA-256: c8f2e6477bbdb0f5e36a789556875e54e0f9fa2020c7311fc82b416aa09d003b
font_01_sfnt_off0000d81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81E 10796 bytes
SHA-256: d2d5779f4c08ae7987bed337c3d63dd352acde9f0fbeee1f2c0778a3f24744c8
font_02_sfnt_off0000f07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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