Malicious PDF — malware analysis report

Static analysis result for SHA-256 11f1a29c2a7ff084…

MALICIOUS

PDF

85.2 KB Created: 2021-08-24 13:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 585a21e094114e7ef5ef72213d4bae06 SHA-1: 65d001ed92f91cd626fd2fac082f9790429cab6f SHA-256: 11f1a29c2a7ff084b09e70ae04efa6a630355c013b599ea9e0da7ce06e42b50e
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f656f76326f---nolaroz.pdf In PDF document text
    • http://malbreil.com/userfiles/file/rosobebarakasi.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f57a2361aee---49149318548.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/anad8qvh5ialfuvu2etvtqb4k5/36471821488.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/09osq16pqr1ntbh2bil3ik8g00/58624960373.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/91415048046.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608bca7357493---rewolabisopekarug.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/defuduvad.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/b58ad754146c3ea4d78faed20dd54f4a/77979521414.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/kuzuk.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6577b90cac---suzinirazejut.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/jegupaxaj.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/23050217216.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/79ae6fd5cf698111e81ac93a4b5f3766/papadimemisonunukobe.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/nesafidokomamugapoxonipon.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/86624464997.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/82512260943.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/69614707493.pdfIn PDF document text
    • http://aweibel.com/Photo/file/vusabizakabusebimexo.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/9hl9qs5e9ql8p7v4486f8jbj60/wapuwekase.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/33h3vc0prun7gbgd1t2sdoupmi/7335524039.pdfIn PDF document text
    • http://allycatering.com/userfiles/88069874773.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ea64148a8---62509780544.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/xolalagigufefezakogogidej.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/jubujanezuvavivusad.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/zusuzaxisodawinelepowebew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=echo+sound+recorder+for+pcPDF 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_off0000e847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE847 17556 bytes
SHA-256: f2c7cd9762905f7ff1142b24447f74c927370da7099014325d874645befbf212
font_01_sfnt_off00011641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11641 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E58 10404 bytes
SHA-256: c03f1f781bc1690b1bd071e5ece5c61b16d7f964992452ea3b2208d961398783