Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c6e4679a04c2e4…

MALICIOUS

PDF

148.1 KB Created: 2021-09-03 18:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 09e10bfcaa646552717d32a24cfe5ca7 SHA-1: 14c93dba0a638924525f872142da2619efe73cd9 SHA-256: 87c6e4679a04c2e43e8ce67503715f08f2b82de47a842d002a217cf38214380b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://medsplus.us/admin/images/file/bovefijijefofetojavuwaf.pdf In PDF document text
    • http://forresterfamilyreunion.com/clients/c/cc/cc72bfd2512333311cc1ef5a4fdef90f/File/sijadisoju.pdfIn PDF document text
    • https://carolinevlieghe.fr/images/file/buxutotamisoxas.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/j81uat2hhkdl97q3c4t36eb090/88813659457.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/55753644574.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/povoben.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/11821817366.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/negudipitogufepa.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9d7a062fc---31196797108.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/18467777170.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/350590fa0ed7b82a83b0761ac6c98285/rewojosa.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acb2ac85eb---59302970209.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/resefi.pdfIn PDF document text
    • http://brnc85.com/clients/878796/File/zawadudajo.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/8730fef55c718bebcb9354db371c3797/diruporezifeba.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/xudupomofukutosirogosumi.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5170252980.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/takapazodafobexonezebus.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/30707133969.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090f2553fa15---68619060212.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/26868380967.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/ed18c0bdced3bae07a1913bef98597e3/14646976806.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/33651830525.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/57868239777.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/25188756002.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=manual+de+maquina+de+coser+singer+tradition+2250PDF 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_off0001d69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D69B 21936 bytes
SHA-256: 2dc2ac601d8a3c80a0a3fef1a77c295510eecb75e9c12e4c40d41076a94fa3cf
font_01_sfnt_off00020f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20F32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00022749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22749 11328 bytes
SHA-256: 5d588136a3594ec7c34144b51cf5d1479096734eb35f1621ffb324f20ec8305b