Malicious PDF — malware analysis report

Static analysis result for SHA-256 58d6f13743bf1353…

MALICIOUS

PDF

101.2 KB Created: 2021-07-03 01:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f513c3e4caae7df446bce308b699ca9d SHA-1: e7f4e41b294a70e6f0cfd22ec78b2bcc1aa2ef3c SHA-256: 58d6f13743bf1353723ba85a0ecea651e7db6842343ec512b1e9bf0f36fc4ef2
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV detection and ML classification strongly support its malicious nature. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://a-kamen.com/userfiles/file/30234038928.pdf In PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/2cm1jf8cnp1coteikj9p0vn1v3/70110634385.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/35110279384.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/defuzedeniberoditolol.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/255b28576383ccc8891b56191b735b54/ripobapakubatek.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/rosesikadiwugorefekivure.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/qu75fh86tt874nouh6dvvejboo/luwawatotepog.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b89ada6f7f---zadijorewibewarora.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b71ef490352---35556136426.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/kamemuzumizilezava.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c61191ccf---lugavimoger.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a776622da9e---65815196862.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/pirudoxipipetiduwuk.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/tivito.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/linedil.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/v5sdmphsbhhramstggghkulk2h/ritazerijotixanu.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa40cdd1df---27572383630.pdfIn PDF document text
    • http://kfbi.ru/content/file/14717775841.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609240b249016---mufaweb.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/bamixowogefigaxifimimeja.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/giwuruwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=template+old+newspaperPDF 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_off00012c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14475 10508 bytes
SHA-256: e28ec49334482e2efc3cfef5081a53aabd944839fa93d6f55be96fbaa23f90c2
font_02_sfnt_off00015c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C6E 16672 bytes
SHA-256: e891d6a2a956cce00432cbb0a9076c0770a7f74d56a890ee56aafcf0e0d539e8

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