Malicious PDF — malware analysis report

Static analysis result for SHA-256 81eae8ee88697f08…

MALICIOUS

PDF

79.7 KB Created: 2021-07-13 15:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b862c5a374da2b881a1e5574df241755 SHA-1: 1bcbc73d14c31f011459424eab87084f17c825b3 SHA-256: 81eae8ee88697f084f23fec850a32281b6704652b6525dc8c62046ea1f977de4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were extracted, the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/fed6b55443f307708296da0031f1eefb/94519399041.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce2e72adf1f---banelenokoj.pdf
    • https://unosms.us/userfiles/file/xobep.pdf
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/zunexojojaj.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c78b3de19---17521290655.pdf
    • http://yangs-ns.com/ckfinder/userfiles/files/20210712212455.pdf
    • http://1qjd.com/upload/files/2021-06-25-05-03-22-PAeZCOFa.pdf
    • https://akrmedia.no/ckfinder/userfiles/files/75693442685.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c863ee9556---sedoxezig.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fae70bd0ac---80225332556.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4a1d4915d---64020285097.pdf
    • http://enslev-anlaegsservice.dk/userfiles/file/guwenov.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/d3rqt0smfqinuvkcvim613dat7/lezasanebimibitew.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/s5lov3cm38l7o0dmslfcm55ro7/gawowamumisabujedu.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/b1e11td9vmkd2a3r0trkinfg2o/88921931187.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8dae0a6a5---divesitamikuwiwi.pdf
    • https://banghenails.com/upload/file/lolaviwekigudufej.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/5rjkhnkgm8bk6dsqcnvua9arq9/tusapisurowusa.pdf
    • http://vivo-mebel.ru/upload/file/59471751357.pdf
    • http://red-persimmons.com/upfiles/editor/files/filabupo.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/60tu6aqjqikmet0628qlcufl7r/goxavokileb.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04571bb470---31723320499.pdf
    • http://dzbnf.com/upload/file///35943715023.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/7d1de43cc1331e9b052dba340c1a85c3/36285244252.pdf
    • http://thrifty-uy.com/files/others/veraxusuti.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/e5174c1e78697b18870a138c167dc648/67237143834.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=suffix+of+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8bd.bin
6ffe9a8eb2af4d8e5b42b7ed36a54749227213225e607115ea3ba4a5a330137c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BD 9908 bytes
font_01_sfnt_off0000eec1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC1 16792 bytes
font_02_sfnt_off000106d3.bin
7d63a38fedcd2f942f3fac448e04e79f7a611ca1391c95443ce58b0441072244
pdf-font-stream PDF embedded font (sfnt) at offset 0x106D3 16848 bytes