Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d9bf5d8ae468f4…

MALICIOUS

PDF

75.5 KB Created: 2021-07-04 03:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0fdc59457d28adbe561c324abe8a9f63 SHA-1: f46e1d681f25b2382f134da2fa676531fa3dec5c SHA-256: 05d9bf5d8ae468f4bd2d1c531ae2ce9ed139d4f3ed65529ca1f0eccedcb843ce
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various URLs hosted on compromised websites, likely to facilitate further malicious downloads or phishing attempts. The presence of external URI heuristics and link farm indicators strongly suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • 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 http://dotacjedlaoze.pl/userfiles/file/30261779812.pdf In PDF document text
    • https://rumahbaruku.com/contents//files/47845859225.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/tukeliwaboduga.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210605212843.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/xinop.pdfIn PDF document text
    • http://iphysiology.ru/upload/livaxajowawipukut.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/tadezaregej.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c402634cd---25531158758.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082cd9020b1b---7223484950.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/nuzik.pdfIn PDF document text
    • https://teddybestore.it/file/wopakomoladinujito.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608010a1a77b3---36456404869.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/25314878235.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba6d5af01c---82356063846.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9bce5b558---dorojotowenanibulo.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/faxajukumuporelebujudo.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609576956b64f---32690239313.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085a931b6e8c---10692053397.pdfIn PDF document text
    • https://irrisyst.eu/files/file/xatowunebuv.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/5659927259.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e06e5e20c39---91999594451.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a12361a47c5---fatibafofudusuzuf.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/2a6e06e7079880841459bab0f3dc58e4/vavaluri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=english+verbs+with+tamil+meaning+pdf+free+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_off0000c1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C8 11220 bytes
SHA-256: 03721b31a45c9100446431eebe2b0a9a62c946639be6e5473e79a7ea8839c50a
font_01_sfnt_off0000db7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38E 16480 bytes
SHA-256: ff6ef8426aea2818a200473f666dc2a5fe5a4e703a90837138df005715d71437

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