Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fea87b7dfa7a286…

MALICIOUS

PDF

87.8 KB Created: 2021-07-23 02:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e9ad4d098cbd114f6ad33b3d504c28be SHA-1: 43a62eac1239e70dcec4eccc7046a4f01286bcd3 SHA-256: 0fea87b7dfa7a286732629b444ea605d938e81ab227f4d5d8b842369b8fc176a
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no executable scripts were extracted, the embedded URLs are the primary indicators of compromise, likely leading to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • 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://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e58023131c5---67504983073.pdf In PDF document text
    • http://mrmax.ca/clients/9797/File/duviboregi.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b30272acd---kawobutigikitijebu.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/sidilogo.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210523162152178.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f09eeb0126---88145189227.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/57099949075.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/e4f4f05066c6b383825c3fb9990c83f1/23558924572.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/lopaposevuzonu.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/48358499247.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/cngehm9j7bhchd6jmuaq8imsqe/fasedasuviwekirugami.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/77186899438.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/78803440844.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/lpa2q8t1cp2sbe4reutd5n1j6k/wigeduf.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609732774851b---7253983653.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/minopinanijefutumamu.pdfIn PDF document text
    • https://loctra.net/userfiles/file/kanav.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f851caa8b8d---wejarowevelowakafiz.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf6b2bfd96---92960354413.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/sexofolafagiref.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/lorovoxisibumupe.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/verenagudaguzom.pdfIn PDF document text
    • http://unionzglobal.com/ckupload/files/fikipujirujed.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/d674da811a39f3af400d05a43ed58d08/43202679711.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=jehovah+witness+missionaryPDF 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_off0000f476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF476 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8D 10584 bytes
SHA-256: 4b97d0ca27dd9a0fd2f003583cfafa5abefa57f5ad0589ad1f1f9a4b85151359
font_02_sfnt_off000124aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AA 16956 bytes
SHA-256: 8e12b1950b302308e65b5fa1e6f373216ce572de35443b09dcda43cca83d7dee

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