Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ec8305f46667eb1…

MALICIOUS

PDF

72.8 KB Created: 2021-09-07 14:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 235046fef73d0fc44a690ede57ec706f SHA-1: 2742d1ca92092f1aabf412aab1697c2ce1712cf2 SHA-256: 4ec8305f46667eb14013ee20d8187491244e7e1185156c0a2b027165014a5014
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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 https://irlanc.ru/uplcv?utm_term=forms+of+business+ownership+worksheet PDF link annotation
    • http://curry-box-deluxe.de/userfiles/file/desijaxufibenesulaz.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/8hifjuj5q11ctepmav65kv7co3/17638110115.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/vakigenakavevero.pdfIn PDF document text
    • http://coopmong.com/ckupload/files/jamujesivizoje.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/bca1be61bc13671cd3a4249d4d9f316a/96871565480.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/dadusikemamafiwamataxot.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/844df0d8e7dfd01d5cd5863c7d5f1d47/wumumud.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/47048905168.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/12658987250.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/jujoveruxomamexilerune.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/014a03461853b45ae96aa50620a41a4b/87258608109.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/46dfb6d675aaf9f03c8b33f75c235c14/19249482094.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/690a693c13c06bc1bd3a487123ce53a8/dutusubebi.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100134f39455---92860020068.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968a09817b4---8276668587.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c6e7966bb---jetodozutokira.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/54108111574.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/poxunujuberifavetalomose.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/guzuzimiruwewososajipisud.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/dobemuna.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16098917a910d9---lomexubekobiriboxonekuv.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/91095064607.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/sogidijinu.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c8df3496c4e---lavovesimizasotazesija.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3bb02a865---71039257849.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f252b9c281---52509387418.pdfIn PDF document text
    • 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_off0000bc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD477 10812 bytes
SHA-256: 605147d4eb6b6cc7e231f8e07ab2541f1e64ed2dd130b0d7c23a698c365f04cb
font_02_sfnt_off0000ed07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED07 15728 bytes
SHA-256: 7c5bb7252c6b88f8d49585ad91560405335fcb255b5aa52f72c665756c866b1f