Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f18bdf1bf32f74c…

MALICIOUS

PDF

89.8 KB Created: 2021-09-22 11:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f9271c48ad70a9d5e306fee840773972 SHA-1: 0df827380d4f79d642de345efc0150d255c63bf1 SHA-256: 5f18bdf1bf32f74cce5d320457ea3c67414657b0a563f826f522f7f7cba95365
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=avatar+android+gameloft PDF link annotation
    • http://studiocalcinoni.com/userfiles/files/bagedinomerexuraxon.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/zisaworo.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/57653427087.pdfIn PDF document text
    • https://tempegaring.com/contents/files/vavupomuvigejafogebumiz.pdfIn PDF document text
    • https://melz-feu.ru/upload/novugireno.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141f43fb9654---46266994790.pdfIn PDF document text
    • http://kes.org/upload/editor/files/namevitesibuvawis.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/92718145460.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/miguzelaf.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/79323659627.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/4qjn4npv2tp8bhm1fvu3k1teg1/mixivotolelunozelanajawe.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/mavagivifigaxa.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/vnt32vs0qc5krn4s6mrc92beq3/93282431039.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///kapevejuv.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/pozosizexebadoputilo.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/lijuxakekasozuzibati.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/59264825832.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/vazet.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/9484900843.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/xojudalulago.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/pazogukumusifutotopebi.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/16470247983.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/toleze.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/79350387248.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_off0000f686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF686 10576 bytes
SHA-256: f29b1b29e2827352516c9c3ea7f37e2333e1d7278b25d1bae6b5a8f62b5ce4aa
font_01_sfnt_off00010e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12689 19412 bytes
SHA-256: 486fdfe937c0c0ed6e5e68d004937097c8541b953d3b36e9a4499d5d6093e6a3

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