Malicious PDF — malware analysis report

Static analysis result for SHA-256 f57ab8f5c4ea4524…

MALICIOUS

PDF

74.7 KB Created: 2021-09-08 19:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d6194c8add5138946c720f351c99512a SHA-1: 86a6591860a118ae6c318a5136608dc5e451937d SHA-256: f57ab8f5c4ea4524d178b445ae6f2ea7106ea296409674b96f5d37dcdfd55c2e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous external URLs pointing to potentially compromised websites or disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of many links suggests an attempt to redirect users to malicious content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://oletrans.sk/editor_uploads/files/nanojufe.pdf In PDF document text
    • http://koreabulk.net/userData/board/file/fulamipuponuvurusa.pdfIn PDF document text
    • http://talesma.com/E/file/jidilusamuxamozajuwapa.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/12b3684c3e37ecf414ddded35700891c/pafovukipetelumivifer.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/5f4a0c5a6f94066c253fd192f529c7c8/patubog.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/xakusugulun.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/99258600535.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/19267542021.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/nusijemunovavozu.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/desuwe.pdfIn PDF document text
    • http://devveb.net/userfiles/file/23809213001.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/40049981831.pdfIn PDF document text
    • http://citty.org/images/uploads/file/66996510155.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161348c7a91442---87821933965.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fca6578911---71481452262.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/xiwoxuwomiwadizu.pdfIn PDF document text
    • http://lotte-ppta.net/beta/assets/file/26509553713.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16130113d5e081---gorexileseto.pdfIn PDF document text
    • http://hzosm.com/images/upload/File/jadaneturariburotub.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/55775497412.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/738de5905bca98ff5154a101abbce695/gezonuxajutus.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/jugamizugapotanipufopota.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=korg+kaoss+pad+kp3+manual+espa%C3%B1olPDF 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_off0000be18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE18 16936 bytes
SHA-256: 83e4600b39862b12d59c340c5a5497faf8cb858b411fa3725b2e8a3d07fead9a
font_01_sfnt_off0000e9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001020e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020E 11108 bytes
SHA-256: 8de658a30b293c41426814ebbd5b9220e4af6e6e775edfcb62fcc7886856dda4

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