Malicious PDF — malware analysis report

Static analysis result for SHA-256 243083a44f585284…

MALICIOUS

PDF

87.7 KB Created: 2021-09-06 06:36:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d8077ec1334756297df3fd1b9a46b4ae SHA-1: 1eb1b7a00acb6bdd61279d67420fd613df718b20 SHA-256: 243083a44f585284a94216a3e110fc7ecc06920d919913bd248d07e4b52dcfe6
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute malicious content or phish for credentials. The presence of external URIs and the nature of the heuristics indicate a strong intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://pistant.ru/uplcv?utm_term=bowers+zeppelin+air+manual PDF link annotation
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607644b697455---medudifaberosuzedun.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/3c713c4ddb369811264f5b7c67bf0a96/95483941530.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/nidijonapuxabaladikifizoz.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/7aj1vk7sku7olvpb2ggfvlesvv/43084128045.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/28456799180.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/31792508159.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/40bff14a429b5f828743c5b498b7b24a/nogerebotorejovobogonigi.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b20998f42---ridowosaba.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/1cc81d52ffabb638035c34277e484ae2/36731657531.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acabec6758f---xavulagikitodisonuzuve.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/81383659048.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd135a747b---6790200125.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/zisokitul.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/pokunetuseroperomizutiw.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/kokafikodusomiji.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/24396634239.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/99790497731.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/dc5728d854ad444b317926a10e45f3cd/78583926048.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/u7g5mvdcqr9k5c00e8213tejmh/joput.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/lolusesajuxagarejo.pdfIn PDF document text
    • http://innotack.com/userfiles/files/dusufapagevewisa.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/newotokeguriridomanareb.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/76260412611.pdfIn PDF document text
    • 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_off0000efbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBC 10616 bytes
SHA-256: 9f17197f9490a1caabd7aa29506683114d54eeffb1a996bd901922a5285c13e8
font_01_sfnt_off0001080d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080D 19016 bytes
SHA-256: 0b1f1b4c323c57e8e28249798ef83fb6f420432534f29a8da6202be614a60be9
font_02_sfnt_off00013931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13931 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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