Malicious PDF — malware analysis report

Static analysis result for SHA-256 8642919538559e27…

MALICIOUS

PDF

85.3 KB Created: 2021-07-27 13:35:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9f4fdeee3dd4cc74d33d6fc65929aca3 SHA-1: 5988b2ee06294ea2b5a89d749f1c3c86dfa616b0 SHA-256: 8642919538559e27dc8d5dfa1b775ca8af26526f2fc52e10474a2a5b8f2a3bab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an invoice-themed lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a5287341a---38123735077.pdf In PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb3c08c7a1---dilomopejiz.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/disowak.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/mubozugusasunu.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/m9cdnkkmseo78fl9q1fm79n0ja/nevofiteziwivubi.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/vepepepozikavi.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860cfce2ab5---weloken.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c3ebd7972---87411776634.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfb94d9773---20902351626.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/fowule.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/32595610023.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/50442536205.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/67028375203.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3602bb2b84---75628445854.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/42635807620.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/c27968929adceb7f0398708dfa619f46/xenevi.pdfIn PDF document text
    • https://rintrans.com/files/28641677626.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/gibonesikuzapamole.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/sezavufirozupakerutibino.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e36653794---pulafikiji.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/12387606480.pdfIn PDF document text
    • http://dsagco.com/Upload/file/mekisijalogadorel.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/4b6114f60bc3f5bd8c4057acb7cf1aea/70060809309.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/20146720849.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+npv+formula+works+in+excelPDF 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_off0000e914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE914 17100 bytes
SHA-256: 2f625a1223c26c61480728ce02f47cf477cb762596146ec0ef5999b1dfde0c4a
font_01_sfnt_off00011574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11574 10980 bytes
SHA-256: b960d302876a695cfd4eb35893694cd9afa5bf26f63bb66cb13cea6c86dab259
font_02_sfnt_off00012ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1