Malicious PDF — malware analysis report

Static analysis result for SHA-256 c50e089b647ee122…

MALICIOUS

PDF

80.4 KB Created: 2021-09-06 14:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c2eee6773cb4345d2ed3af6c1b0ca137 SHA-1: 2dda35e597280d46823120226a630851c8f24d4b SHA-256: c50e089b647ee12286d0b08ef076eef13f1a9cbab3077ff35593f0c4ac8ff266
156 Risk Score

Malware Insights

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

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, containing numerous URLs that point to compromised websites and disposable hosting, likely intended to redirect users to phishing sites or download further malware. The presence of multiple external URIs and link farm indicators strongly suggests a malicious intent to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=the+coming+revolution+zamir+cohen+pdf PDF link annotation
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/l9umi32f08874rpn7rnj8f3q1j/70740156328.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/7277136977.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/gbkdfkkvd6qdbgjkkqabqaqgg9/kekikuzedazegas.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/3pdpve77f0q9k2i91snqqggf83/wopuruxomevumutigugu.pdfIn PDF document text
    • https://estoniapools.com/contents//files/18163702217.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/xajadotudujuzadapekexolu.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/73643394932.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/14cffd8d99f66a80cfb5e5c89bb28837/zutinamuforadogukanak.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070b1f50a497---kebizotujesu.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/29333606493.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/727d1d60167a6d25172dc82fc6926bc6/kebibit.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/kukom.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/16240400303.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/ljakg0r5roq0pragn0h78fqg01/tanuris.pdfIn PDF document text
    • http://funperm.ru/content/file/98385669359.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/38449252078.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/34701643618.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/tedusisujimogibufevus.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1612cb8a65434d---wazuginuperin.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210708125321.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/55876713572.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_off0000d2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A3 11088 bytes
SHA-256: 8fb234d0e7e058c508e475370489245bccb45ea8db4f52131f114cb71be849da
font_01_sfnt_off0000ec23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC23 18516 bytes
SHA-256: bd0f9ff858c898e2a33beccc8c8e53db4c57e6c702b46ca0cca2e26d81f5da53
font_02_sfnt_off00011c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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