Malicious PDF — malware analysis report

Static analysis result for SHA-256 3451f6a40cdd9dbc…

MALICIOUS

PDF

91.7 KB Created: 2021-08-07 01:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 84216e196dd0ed4995dd127bfb39a9d8 SHA-1: 17e84482af7a50a287a9986a999a38300f756397 SHA-256: 3451f6a40cdd9dbc887d58dbfcedd662a37ae9153a65fce6df6f41e3420db1d2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://archism.ru/uplcv?utm_term=mood+tracker+bullet+journal+printable+pdf PDF link annotation
    • https://aquaprosmart.com/userfiles/files/zuroselaxibajipa.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/ca37e98640ef234d4573a6d0f4362180/kimelara.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/gogitubimoximopijomeg.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021523057486628.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/af8142a48c8456c933425c72b489925e/18240132860.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/i6g5tn0njlticfijpj2r9kik7k/jukofek.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/ihl5krpjode01j0h7eps2epuho/49346874283.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/kumem.pdfIn PDF document text
    • http://goldmustang.com/files/files/10964852262.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/9801584894.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/vezoriguvajobese.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/pilegenog.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/7ofq8srmmvqv5o29upu5sdp6k1/mofazegurajumarira.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/161003eac4717f---16477605350.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608be47cefede---15963268963.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/nelapurilobodobigobizij.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/l6fdc0er4u287dghi5t8s310og/8332469370.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/14785884619.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91d8d4b38f---32761455124.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/wipuwubow.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/1990798904.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/jowerewerejademuxepi.pdfIn PDF document text
    • http://gpshardorawal.com/hemkunt/userfiles/file/56791781952.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_off0000fdf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11606 18888 bytes
SHA-256: 091ab27ac5dee218ebf788926e5cac1f550e29956e23ba79f2126d4973b7a2d3
font_02_sfnt_off000147e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147E3 10900 bytes
SHA-256: e516f28af25c81369d4b33c9643fa8636c0f9ddcb0f27d0a37688b6867fb9563