Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a0fe3214942aff…

MALICIOUS

PDF

87.8 KB Created: 2021-07-02 13:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e4027d18048faa59d9e55b1eee49622 SHA-1: b41793960af5c9a8944cbbf1e7c927477ef38faf SHA-256: a8a0fe3214942aff3c70751394956f8441b50c4ae912c77820f0bfbb530cea93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it functions as a lure to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d17ef08e83---noduvuzuxezagunav.pdf
    • http://www.urbanwaterways.info/files/rarolewafobuxos.pdf
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/zagomumeluvakaxura.pdf
    • https://juniorclublivorno.com/sitonews/images_upload/files/tijozeronagigegosekos.pdf
    • https://nnkcreations.com/userfiles/file/63564273221.pdf
    • http://ithaca1961.com/clients/875375/File/sakilatikebivetenafewo.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0cf6d2454---wozutaxetuwuzomegulul.pdf
    • http://leaguengn.com/userfiles/file///xedogulimolisozogaberaj.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/ec6a8f8bf71c307884d39252121d2303/2070040405.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/mt2md9esuibo9sbookqas0kn30/kozowozilanojedipiviwaxiz.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/487967cbc9e370f2f49f685ad2a6450b/jafijitixaza.pdf
    • http://bong-dem-long.org/upload/editor/files/68534715743.pdf
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/lamemejiwolotugefa.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160779f789e5d7---1929836167.pdf
    • https://groupunsur4.com/contents//files/68271048047.pdf
    • https://betalinktech.com/blmedia/file/ropifinuw.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160741c6dcf4ba---13435055741.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/b1e4be6a86a5b370cb21a379189b7694/28501346888.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c12b5d73e23---vagejav.pdf
    • http://arch-teh.com/pic/userfile/2013806659.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/f1c885b5bb886544c24052ead6c95f04/mutulidujekade.pdf
    • http://taikenplan.jp/ckfinder/userfiles/files/17000565347.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acbb2c43d75---rodojepuwefusunumoro.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=every+disappointment+is+for+a+good
    • http://irodori.kir.jp/files/file/35449416492.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f46b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF46B 16792 bytes
font_01_sfnt_off00010c7d.bin
2e11cb7fa43ed52ae64d0e25c5a5dd5e5d0bc9f7c1ffb1febed77f2294a2dc16
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7D 17044 bytes
font_02_sfnt_off00013863.bin
e0882dfc39f4adf23885a2e38ed2538ae9c2af7a7e159fea3963360e0e801b3d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13863 10960 bytes