Malicious PDF — malware analysis report

Static analysis result for SHA-256 db77bc2be0edbd8f…

MALICIOUS

PDF

88.6 KB Created: 2021-09-22 15:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f9334fdc49996e220e40bd02c9bbd429 SHA-1: e1bc40cef8b78d34bb381091fa4d9372fb3ec499 SHA-256: db77bc2be0edbd8fd92604ae478f876c4a324603e340045557d6e2f20c8c8688
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://dhins.com/testingsites/advantage_aviation/assets/media/file/fokudosakiri.pdf In PDF document text
    • http://hc6999.com/userfiles/files/tezovovem.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/75097125598.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132f05590bdf---60060900131.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/betoxupofozaviwo.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/75000922828.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/ziwamozedu.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/basadufijijidemosewi.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161318ebac4dd5---newiw.pdfIn PDF document text
    • http://clingac.es/d/files/31652891440.pdfIn PDF document text
    • https://negaratoto.com/contents/files/48673417890.pdfIn PDF document text
    • http://ndt-ultratech.com/files/29345919821.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/wutizusexogib.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614090921c035---falomikilusoxiwu.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/87816904888.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/50219937143.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/66934567805.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210912073013.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e62f753bd2---fapufuvobojav.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/36875065309.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/3e248aa287fd4f74ca8e51b0accc7493/91992932042.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/84806704017.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16135c20fc7e4e---65273282465.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/23648349527.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138008b4bafa---polojuju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=telegram+not+opening+iphonePDF 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_off0000f0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CC 19800 bytes
SHA-256: fe09b3c28ef9ad2010afc04291918be2fbf301bcaaca2eb0bbd45b4444afb409
font_01_sfnt_off00012508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12508 10492 bytes
SHA-256: 46e6e592ca27b28d5b467b7cf3f8190b70e9d5933143f233dee40a27b96b5b83
font_02_sfnt_off00013ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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