Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcc5a8780a8c8e67…

MALICIOUS

PDF

98.2 KB Created: 2021-07-08 00:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1b801232efcf7c23eb9afaa3bbbf01dc SHA-1: ff17cf3c13894d0e877fb32e005d30b0fa24dede SHA-256: dcc5a8780a8c8e6798ab8873a3fdd0ddad75b7b4494352ca5c2f634e8cdb3e87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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 http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/7b392302b7683130141e776ce798f267/fevusosewelodiwiji.pdf In PDF document text
    • http://adainst.com/uploade/files/20210621174844.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fe93900b6---suxinibonuxuxi.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/mederokovu.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/ad66280f810a4e9c704ff3d23a498ad1/napesilorowog.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/89993376582.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/39ff234918c2275af88264acf119f870/jilufexufowimufemenabi.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5ab6a8efa---218707866.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/3ef069a8a99c8942a5880144f7ac6651/rovininopokaberewenimanit.pdfIn PDF document text
    • http://hotelstrack.com/bot/ckfinder/uf/files/wabumuxe.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/398b91c99a67500b51c99ba3476d12c2/javulebidinamejigerojali.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/1a9lchmnk29co462jo4kck7h66/vakogetok.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/35904147192.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607200911aab6---wiketalisazusu.pdfIn PDF document text
    • https://purefeeling8.com/data/file/68256638326.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/lotaxokes.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/zunukivazajifonu.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/49ffa0836c5a1eebb87712d17f1132c3/89548445535.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/sodepidinug.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/81360163438.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/duzuxubewuxop.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/b2f5f16e00165e5937644c6653219cc2/momesajajegimeremoxib.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/4cf74b5f11b0fb802d2853258d9e1a53/zagidaweguxivafate.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/9609fd3d6928b0f5cc0b7844ab71609b/79234207760.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/35389270076.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/wizizowuwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=hacking+the+case+interview+pdf+free+downloadPDF 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_off00011ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000133ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133BA 17864 bytes
SHA-256: 36c8458f727add5871b1f7033f06c362636c50efdfdc5d11d4db205a07383316
font_02_sfnt_off00016160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16160 11132 bytes
SHA-256: c6f4072310cab26c433cc3c7b6340894b4b0572879bf6a7a3b2b139d3c8e6269

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