Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fba7dc96078a2d4…

MALICIOUS

PDF

82.3 KB Created: 2021-09-12 15:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 676760a5212b50d42e5bdc170fc964d5 SHA-1: a1ca8f1249bb586050797669bad551890f1dab4d SHA-256: 5fba7dc96078a2d4f86eeb7a4b30686511b89584703dba346f68babbe52dc77f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to various compromised websites and disposable hosting domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings indicates a pattern of using such documents for malicious redirection, likely to distribute further malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd1a32b15e---32519582332.pdf In PDF document text
    • https://edex.co/userfiles/files/60705308499.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/36798485327.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/fenujasorekesafi.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/88807166103.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/juxibeni.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/36896007060.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/74289380656.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/18962747936.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/jejilotusogudotope.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7041a2b47---87816999736.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/57634647613.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/wozelipoxemik.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/84d9107bcbc95932fc93b5c17d104bbb/sufivolobajemonoba.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/d967664c998844c63e041b98e879042b/16305580331.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/0r6kv4nkiu3ajn525dd0re3ht8/rivasidizaziminubuzokawi.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/92125961413.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/16311347371283814552.pdfIn PDF document text
    • http://kmconlinecme.com/userfiles/file/ripuno.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/27083389708.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/xizizetafobe.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/zemekiweduzerevovezo.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/18048841743.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/12072599375.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=brain+games+apkPDF 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_off0000de96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE96 10476 bytes
SHA-256: 0f332fd14a612d6352548f201ebcfe4db1088db0ab76ca7236320cb11911bfa1
font_01_sfnt_off0000f651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF651 17596 bytes
SHA-256: fe189721b717bd63ce0c00ce5c3f2e00c082838370e1d79737ff986ad9084057
font_02_sfnt_off00012377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12377 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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