Malicious PDF — malware analysis report

Static analysis result for SHA-256 dade0b181cacbce3…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 14:12:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f89999786015d6273aa9757068d07527 SHA-1: 4db16c2a465637094be26386a9b673c17971023e SHA-256: dade0b181cacbce3e1e40edee070f176a8226dd65989512fbb1ead3c69a6f50a
172 Risk Score

Malware Insights

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

This PDF sample was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content or downloads. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bistakalikotenetwork.com/userfiles/file/susuvi.pdf In PDF document text
    • http://doks-films.com/pcms/content/file/fidigosamimumugo.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/givepamidinovobupetet.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17b625a1da---75019114713.pdfIn PDF document text
    • http://livestocktool.com/d/files/zenixalagozisegi.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/gasafi.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021061605173180554.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33a051e17c---gowes.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/sugipiki.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/6a0725b658cb514a53ee361e0aabce61/68465915693.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afb217c42d---29721705449.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c69452172f9---34451009660.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6953fb6a7e---wetojobijerekodamufizefid.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/60876265884.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/2011987897.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021082317285997.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/7fe08009b3f2fbf6725219677602577f/ritiwugixonopalugovi.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/43917569096.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/67074549583.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609007cb56bf3---mikipituxif.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/bapoboguba.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/41536548748.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/1942741242.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/zofakoroximufeduzaf.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/16768300958.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=pre+matric+scholarship+form+pdf+downloadPDF 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_off0000d7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFED 10972 bytes
SHA-256: 56fb7d481ae3cbca28aefdb0201679fdb617e449f5a46fa0266ba355219ab4ad
font_02_sfnt_off00010940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10940 19480 bytes
SHA-256: aafd1367ab5b17376f9992a90ceee3767f02be87b6b49209d980784778a071fa

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