Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc9a8710d02082d3…

MALICIOUS

PDF

79.8 KB Created: 2021-07-14 04:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: e1f4934779d9194713161d61cb19b12a SHA-1: 6ba32dc19c67d2b0f757675499058d00236a3735 SHA-256: bc9a8710d02082d3d637edb92b65a3e931f5a0d01ce40058bf1b9dc24f59250e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document detected as malicious by ClamAV and an ML classifier. It contains numerous links to compromised websites and a visual download button, suggesting a phishing or malware distribution lure. The PDF's structure and embedded links indicate it is likely part of a campaign to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=laws+of+exponents+review+worksheet PDF link annotation
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091609597ffa---84379860503.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/vojimef.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/23208920950.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/60704566091.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/4p0cltq47gm6gr2vrgo6glg03c/8361787236.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/padodemur.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///baxidifakifuburube.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3628e25a8b---zejutizerowebubewakekusaz.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/kujalelijotogisaju.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/pipizipa.pdfIn PDF document text
    • http://amdind.com/userfiles/file/deziwejojevova.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/13192524964.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4a62cbaaf---27148672369.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/3n0pi1e819jhvjjbi07phen7i2/badarolizedirivemiza.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/zuzedokasokiro.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/de6hhu14hukpale1696bokuti4/75272169863.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/l5oirkek5jk3rgidqkjasoq28q/sawufonobefop.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/22731796626.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/zafugupa.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/96327011675.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/fvnjh2psakahd7i0fu5mg8sljt/xoxufezarugawafekobew.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/62560677540.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_off0000d388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD388 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9A 17084 bytes
SHA-256: 6d4498a6f30ec5e8e8ed8c49b6b4bd21e7b666868b3812e50171ae1ab931cbbc
font_02_sfnt_off00011854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11854 10712 bytes
SHA-256: dec91d10be449d251da500bd7e442cd2db06097526c97444c2e4925abd9a7f34

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