Malicious PDF — malware analysis report

Static analysis result for SHA-256 750efb1374f08c0d…

MALICIOUS

PDF

87.6 KB Created: 2021-09-05 13:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bbdf3dd2a4ee94c87b67e3090982f1d3 SHA-1: c064cd98b5a1e3a2784996b1faee0845b5724980 SHA-256: 750efb1374f08c0de2db430223f84375ff068f242b6bd700adcfbfe5f0402a77
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770d115edee---benelomokimoxokatozemakek.pdf In PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/krl6c2oko15o47fvp90orph4nu/1516314979.pdfIn PDF document text
    • https://somogyplusz.hu/files/lowafoluwabatujaronesanox.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-3/20210503155822942786.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/18540482247.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/63f0f72cde41b8ab15f3fa6a276710e4/sawusigare.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/xarewusomirukisazawilodu.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/71857786182.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/tatumujo.pdfIn PDF document text
    • http://hollywoodterrace.org/clients/863344/File/35272771360.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/sf04u9b27kml53r46cce1ohul5/sijuxa.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/11062892893.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/25365506560.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/simabinalededer.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e3d339796---96631981964.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e58976c44f---92918180968.pdfIn PDF document text
    • http://webelievedin1984.com/clients/6/67/676624d6593aa512bfa6e10e765af00e/File/98287695472.pdfIn PDF document text
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/19745124907.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/rebuwekulanesoruzaxef.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/komezezozezoduka.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/34004223601.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/59380192560.pdfIn PDF document text
    • http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/65395128184.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/f2fffb6f645ce19ad8d478064d8287f5/58159396143.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=private+sub+worksheet_change+byval+target+as+range+vba+excelPDF 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_off0000ed26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED26 11240 bytes
SHA-256: 6bc29013874185e855b2c3abe849522eed50b018c3789a48fb6ed1bc00f42e5e
font_01_sfnt_off0001079d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAF 18808 bytes
SHA-256: db1d9581f9fb5bd795c9843465886e41b7092a94f1fbcf4aaf493dabc7a01740