Malicious PDF — malware analysis report

Static analysis result for SHA-256 67628e69156d58b0…

MALICIOUS

PDF

74.0 KB Created: 2021-09-07 16:36:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1b2868bf5cf04a8453baccbd8e3010b4 SHA-1: e03827045bccd5d1fd27a451b37a5c6b7a4057d9 SHA-256: 67628e69156d58b0095917662248b3062b655db4e2870a85c44b099122c6a772
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous external links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm. The presence of 'utm_term' parameters in some URLs indicates a potential SEO manipulation or phishing lure. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malicious redirection campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://allytemp.ru/uplcv?utm_term=putzmeister+tk50+parts+manual PDF link annotation
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077919869024---59379251349.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/32885676484.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/5461049860a9117b160d6.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd2a1143b45---14256230995.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/90057652757.pdfIn PDF document text
    • https://hostingyuvasi.com/calisma2/files/uploads/pogixupuzoriz.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/cc670631cb5279750b99978e9ba36122/vafiralomawubenon.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf8fe0a1df---devetozefusolikig.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611c892be85ad---78626038801.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/08/04/gojasaje.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edfdb680d2f---3932885234.pdfIn PDF document text
    • https://palet-school.com/files/files/kemokabopumupuvezes.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/9qkk2r7csq9m43om6amkcvim81/vikorewixo.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/54673246091.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/38413546524.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/nefawu.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f2d1de19f---zamaxifukurelixarisidupus.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b9d6c57c7---ludog.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/segevupobugawif.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/javuzaduxinizisizos.pdfIn PDF document text
    • http://ttc-investco.com/img/files/54739629215.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/b46df18de766548dc9fcf4c20474fdec/feditifonile.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/f73186211bd45807bb7ce511908c3de8/vudaz.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_off0000bce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE5 10804 bytes
SHA-256: c42a4f6bdedc44775368dc74bffa8cdd78efb9b7bd951b29b94aff98a6b04048
font_01_sfnt_off0000d5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF5 17408 bytes
SHA-256: d0214d5bb87c04f2561bf8e31bcf200fe4e4d2909aab6efa8e10dc9aef6d5d71

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