Malicious PDF — malware analysis report

Static analysis result for SHA-256 b56e6bce13835b07…

MALICIOUS

PDF

84.3 KB Created: 2021-07-15 23:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6b4f6ead4dee78f1006c6735e94f60a3 SHA-1: db55b8d1fd335a00612e666c1dce6c4c8e167737 SHA-256: b56e6bce13835b0709b6ce42eb86f9f237a874fab1967dfb3c0fe2b93fdeb176
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. The file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the presence of external links and the overall detection profile strongly suggest a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://crewmak.ru/uplcv?utm_term=merge+2+pdfs+into+one PDF link annotation
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/86fdc0955c1fef54457e7bb92a2a3bb6/kezuvemugof.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/98743348533.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/1040343a47e1f985cf8775f53448460d/semalunibus.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/fufewijidunibiti.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/41714174926be937e8261da71bb0bdf6/ruluziwebekutotinita.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606da41575b0e---39626725884.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/f4mvhsqo8u0rjjhnn6cd9vfqf4/sokifekabadozodojuja.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/mui26q5i66miompukpi5cka9e7/4594622851.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081aedc8829b---37982434427.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/67602885360d3203508f8d.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085faec0d463---47105091492.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/75229663183.pdfIn PDF document text
    • http://iziusb.com/userfiles//file/26350059143.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/94314492387.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160730c9ad7b5d---paxejuzeruro.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/19893722438.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaad99f2186---limefopavira.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/f00e7d7e556fca204c98fd2239f3d359/65156293709.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/sozoveloxudajekozota.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160df0e866bd61---81699911366.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/38f58c38163d897b9a09d320c0fa4ece/detanitosakus.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/74199363800.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/7738613.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/forujejodajan.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39cd2e6670---12397093900.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/xinog.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_off0000e6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C9 10576 bytes
SHA-256: 0bd21d2f72d7e729b6080b1d6a085a7ee8efaaa94f29f78f4795533af8c01fa7
font_01_sfnt_off0000fedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F1 17088 bytes
SHA-256: 584f0ba356a950975c3bd3285db4d59c044cf719c8fc7d7154160557ce9fe82e

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