Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3eec2042eee57b9…

MALICIOUS

PDF

84.4 KB Created: 2021-08-15 06:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 35b855b77faa34869006180ec3f8abf7 SHA-1: 6c39ea0904dbd251b2e44a266bf245a079c05b04 SHA-256: e3eec2042eee57b98c32381a83bc8a36d732f00f2505e616e9df957aaaec866d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL analysis point towards a malicious document designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://voszveszprem.hu/_user/file/potenuvav.pdf In PDF document text
    • https://armenia4d.com/contents//files/16012399455.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/83513025918.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/nemumeze.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/farozagugokubopajuxobatob.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/2625066201.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/debavakavikejikapa.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/femanokanetareteserexa.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/52666078736.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611778041584f---zojaboxetu.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/2086b9fc1d2adecd218cff6b2ec76add/90677212798.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/74634254821.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/v7g9af33362cthn67m7rq114vg/xigevadixoguja.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4748a8886dd1d4cbc1bed3d6392ebfaa/68224332387.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/87823613814.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f06220425---sawamitabaw.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/20486410020.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/wagixuzef.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///janojakubuwibefukajujitin.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-19/20210619135102319219.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/e911db789f2aa09f2fcf79404c1b7f8d/36010734682.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607025630887c---58746575034.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/0f330d946848251328824d3a7423246b/bonududamololi.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b13211a6f---71463511508.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=minecraft+apk+free+download+0.15.0PDF 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_off0000e71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71C 10988 bytes
SHA-256: 9910a38fe268e2a878d5a2713761fef1fc6d194e06c853142bf09e27e37d89f8
font_01_sfnt_off000100e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F2 16356 bytes
SHA-256: c343a5bbc6e4b6298d393214e49629e5a2d418d0f6352c9e372baed79c946689