Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c1dc8b6e772228…

MALICIOUS

PDF

96.1 KB Created: 2021-09-07 15:56:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b1828f1bbfa2ce6731b44d963ba6b182 SHA-1: ff37bf95700a50a1b87febec60f227645451f300 SHA-256: d8c1dc8b6e772228d5937df36d0ec5b08b6d4f66e270a913da69a3c10231a6a3
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm with multiple URLs pointing to potentially compromised CMS upload directories and disposable hosting, suggesting it's designed to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 6

  • 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.
  • 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://uleshuzatshop.hu/files/file/xatinuponupitegolib.pdf In PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d0796aa665b---15504374652.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210905_329276C401C85717.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/6f8a1dcfd55bcc3b2c2ba7e1e8888507/posujamiremiwun.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/vufosuduso.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cd3e2086a---jejipipozexel.pdfIn PDF document text
    • http://adveotec.com/img/file/dupadaw.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/73993578496.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40436313375.pdfIn PDF document text
    • http://orem.mn/uploads/files/50962778190.pdfIn PDF document text
    • http://epicridesnepal.com/files/11070183738.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///53942770916.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae72ffb2914---baderevudubepenaliko.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/voraviwaduvemibebakem.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/48314835815.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612db21c10ebe---666236047.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/3ee4e23e787fe30cd5c23f1f497d829b/85042961358.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5e8qq1u370qj9ck2ajg44k1n06/wagetis.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/4e27a6b57f7a28a5eae58276e5bf61a5/20983056009.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/473373356bec82c2d47c5c12c76dfeae/nezamafif.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/b30ae730fc0aebbbd2bf0541210b222f/38185246407.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/c1d2ac381382dc1bf60ea4d9975ae5c7/40937687010.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/rpqepat5fggs1meenvcuek9p3n/lofelaj.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/molasulonabaviba.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/90317282464.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/afca331f1b550483685d32d09a270564/12772275364.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=br%C3%BCche+addieren+subtrahieren+textaufgaben+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_off00010981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10981 11320 bytes
SHA-256: 2e1fa0de2d28e16ccacce93b87bc055155338fb38702d1789cfbf2363f568611
font_01_sfnt_off00012366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12366 20552 bytes
SHA-256: fdb263082bd9104bd63da761da90e5aa715ac8b4a92a08b0473f25c817197071
font_02_sfnt_off000157f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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