Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d2e8671e509d42a…

MALICIOUS

PDF

75.3 KB Created: 2021-09-04 23:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 61115fcea085e42dbcf5c43a8ab32834 SHA-1: 5226ee6b4dbabab16dfba39e96edc78a0252731b SHA-256: 3d2e8671e509d42abed653cdbb2e17da6488932d72495e25683ef382cf60c7e6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to external sites hosted on compromised WordPress installations, suggesting a phishing or spam campaign. The presence of multiple external links and the nature of the hosting point towards an attempt to lure users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/sebevunalakufuvazezal.pdf In PDF document text
    • http://piemonteforyou.it/userfiles/file/dutipo.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/wodolaraxesojojub.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/67807573435.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/71069b01d4937b169df4677119e98b55/61074722789.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/43657714342.pdfIn PDF document text
    • https://pr-dienst.ch/file/teropuwulagaza.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161137f1cb6500---basev.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/9b2b46f971b043cfa2776125c1c18287/84477568737.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe83da789d3---fawudejujalipobunuvokiv.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/af8c5973be185e98a67e273af6b17fe3/50741187674.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/top8i3am4d5k01ej94vke7j5u7/tesumevibomolu.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16074d9fc73c9c---wivaxowojumemiguxixu.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/7a8455c681232ec5e0bc663b296dc185/77048590035.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/jakevejab.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/18763896602.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/60e9f80bd7d1c39b7b0f4e9758f8e318/gomejeka.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/22941860918.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/28824564187.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eedca041a0---fuwulitodimanorebusiparan.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/cml4trcou75aqt00kgce8fucpd/8875597511.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ar9dpr8i1dvhcov1lk6n6ilrc5/94176744080.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900aaf0765e---pubejejof.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/81801395260.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=les+prepositions+exercices+pdfPDF 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_off0000c21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC21C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA33 10464 bytes
SHA-256: eda6a17c1d29e826ebd3662bae261725b12bffbcb2e995fe2baa878759b6749b
font_02_sfnt_off0000f211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF211 16840 bytes
SHA-256: d1ab0ab97ba47174ec55802e4ded19904dac195691ad15413781db85fe1cc91e

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