Malicious PDF — malware analysis report

Static analysis result for SHA-256 64aef4b72017acd9…

MALICIOUS

PDF

88.3 KB Created: 2021-07-24 19:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5f12fa548d6168637d359420a6f1a60b SHA-1: 73bedd112163ac3301ee73f86a0d7645b56e19c1 SHA-256: 64aef4b72017acd916da79a31e19c2ef18c866143a6c4316dcba0c34f7ae48ad
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and embedded URLs are consistent with a malicious PDF designed to lure users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://laser-piskovani.cz/democms/userfiles/file/dapokadamitagezupaberi.pdf In PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/50112875896.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/85379963550.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/bb9bff1a985910570e7903f783078c1c/nemofevinejolaj.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/wofazevogevopimazikusud.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/gotonegodopaxigoma.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/vuvaneto.pdfIn PDF document text
    • https://rosycaffe.com/file/87532709443.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7a303d63aeec21ccdbe545a2fb6b4939/76904018507.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/912f61cef93dc383fb3d8fdfcb1c0d92/90553275371.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/7c604aaeac76ca64f42840d39341079a/27871664496.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800bec4a687---6906614962.pdfIn PDF document text
    • http://funperm.ru/content/file/72738974621.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/kaloxegokirowakukotuj.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/zovazutakamuforugusunepe.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07f5cc2b2f---lewavidobosaremeferovu.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/fakutigavil.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/76544990760.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/dagosozadeditika.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16078337d995d9---82304783018.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/9o6ckf3jvl0o7gclpj1a192vro/55255794477.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/zinezananawodujuf.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e2e4c1d8c---miwovajizorevege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=the+mathematical+theory+of+communication+shannon+weaverPDF 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_off0000f598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF598 16968 bytes
SHA-256: 3fd3ab6fea1ee3e0b884f999863925f6dfc8b93e3bd56fa9180c72debb8168dd
font_01_sfnt_off000121df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DF 10932 bytes
SHA-256: 4aed9b477a813559c00758264ef03557f6bc9c60b3c7cf72b23c70a7614755c9
font_02_sfnt_off00013b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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