Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e2fc5fcb1b0e4b…

MALICIOUS

PDF

91.4 KB Created: 2021-06-28 08:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 52121bb6208e47f52b28a2dd71fabe1e SHA-1: 81564a816f482fd3bc23efe0d24f98cff7bb6da1 SHA-256: a3e2fc5fcb1b0e4b0fe7df798f1eead87b8c503f3d68190fbbca548ae3cac155
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://wastran.ru/uplcv?utm_term=live+cricket+tv+hd+app+free+download PDF link annotation
    • http://cristal-in.fr/userfiles/file/77790342243.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/bf80b60fdb28e423ca869af7894c8ecc/newalosebugozota.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/3229022013.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/40241954828.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e835604952---zuxisikivudabewujuwisev.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/10c2e66137ed1f92930978f939f646ae/93337711008.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/587b378512e862ba2d2fab6156a154fa/veruvifotazufebomenir.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/2521978124.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f10a1bfeec---xesuxojedivafejidugifowuj.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/91b20252fa4f15c25deeb74695ce9f78/kumipo.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c72ca8e8b8---27555757806.pdfIn PDF document text
    • http://sxcec.org/userfiles/file/xegatakanev.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/k56vk2tusrjbqsujvsqdahig46/87997475325.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/8f9eb0f7b4c1f990dff253571951a85f/zirilejegasum.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bebd0eedf74---xuwulogitokaligivajudokix.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2a763292c---51175668834.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/10986642771.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/d252e12b7d89a23a41e146a3a1a92215/51135297970.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/80368391408.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210615180536.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/pawer.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a808ac27c---dozanigavirugipemu.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4ca08263516b413f24c9f38c2f98528d/tadujelufanab.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C8 1860 bytes
SHA-256: 562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560
font_01_sfnt_off0001017f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017F 10748 bytes
SHA-256: a7dd2862aadfc05facb7bfbdc9f6cdb5613d2ad5008b0c84e8edf45da9d5808b
font_02_sfnt_off00011a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A34 17300 bytes
SHA-256: 1ff61adb0e12085e58fa8eaed72cce44725e15d98368e3de3a1e259e74341ca9
font_03_sfnt_off00014768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14768 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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