Malicious PDF — malware analysis report

Static analysis result for SHA-256 35e2790aff82e643…

MALICIOUS

PDF

71.8 KB Created: 2021-07-31 00:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 018da92973bfcdb74b381f3dc4ece990 SHA-1: f181eacdfe4b6b2fc4e236e83d4d22decdaa2abb SHA-256: 35e2790aff82e643da75161499a09b8d018f061a738843da3e79f1f93ad918db
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking readable content to infer a specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f118466c4d---73059063168.pdf In PDF document text
    • http://hurtmar.pl/Upload/file/79565527323.pdfIn PDF document text
    • http://allasclub.com/campannas/file/wovarejesuro.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/hfi62799g6v9vph1n4oa6eu645/54407961895.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210518212951_1011933398.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607bca8f1953e---15757254807.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16092e57de90cf---daxisopokebekor.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/37120663149.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/7559302962.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/olc1ujmlban98ev96kgjudd102/40933872541.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c45ddd472ee---74887849661.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/59327181298.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a789336d515---63100552708.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/vunafidegepopijo.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/51120570213.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/ppt2q023lfqf3rd8o9b3mdedbc/lafemuxeji.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021071603264470554.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/gd5m35si37f5gf0891nps81duk/josopapakawese.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c025dfdf9---8144217547.pdfIn PDF document text
    • http://ort168.com/upload//ckeditor/files/kepivufoduvujisejibijo.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/28898218313.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/57382956700.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fe4385c0ae5---sefenurovetatorumub.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/3c87dbfa31989be14af977a10466574b/sagixodiwuzepi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=masterbuilt+smoker+bluetooth+connectionPDF 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_off0000b83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB83B 15432 bytes
SHA-256: e5c2d2b326d059b38742b5dcb07843636de2871fa6934be238c3f6eae0c3aea4
font_01_sfnt_off0000df0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0E 10820 bytes
SHA-256: 44ca7e516d3a7808f2c3c687e3e5e921c199acb7edcafd65bed268a48a1d7434
font_02_sfnt_off0000f7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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