Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b26d1b2382ada21…

MALICIOUS

PDF

86.5 KB Created: 2021-07-01 10:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fbb6051a3e78e7642d8d240beeed17d4 SHA-1: 0f411d1113a39c3a3ba2da1ce6bccd10b0b8c92e SHA-256: 1b26d1b2382ada21e249103b15df7d13dc68511b6fa19250314f12c68dfeb673
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1190 Exploit Public-Facing Application

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The heuristic 'SE_SECURITY_BYPASS' indicates the document attempts to instruct the user to disable security software, a common tactic in malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://j-line.ca/fck_upload/file/bukojujevigud.pdf In PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/602d3dcd4cba80cace86200b85c928f7/96826541370.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/1796268075.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/f9ca5ff49d24e2ba79651089a82480ea/papawobemol.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16092579b9da90---95571699680.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/25b8c39ab00f33d5cca14cd6ee3a55b6/70925096276.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/3791663013.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075a04713f8f---63919595777.pdfIn PDF document text
    • http://ahs1966.net/clients/f/f9/f93f52488d971b5f2372adc2bdb16541/File/7296486552.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1e8aeb4d8---kudikupibewigabusu.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084122f961f2---25082386118.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/doguxumulojonezumuwovilo.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/7df11b1ccb018f8b2196195a5ca06d0e/38312586001.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075d95d4f8a7---6509573177.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607662f00b95e---ruvaweli.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/dexobibajoketo.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/mubur.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/didimajon.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/1010992a3b397a784d96d705c2c8b620/41372609021.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/eaa29j4v1l1nh5es9vo2l05bbf/tidigogitaseravetiz.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/fcc7b04ee07e12cbbaf54e50d5cb02e2/desazasurimukonafob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=asexuality+in+mediaPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A2 10484 bytes
SHA-256: b5bb98650c1d64b6821e50737d7eb2794c1c0aa964c811bc7b3c5cceb06b2bb6
font_02_sfnt_off00011171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11171 2720 bytes
SHA-256: 3d96be709faea5fd26351a9ff8de99d830ecb10ee17b856b59ec8938b71b7432
font_03_sfnt_off00011d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D03 18108 bytes
SHA-256: c3bddc4de3dc4b5be2c7f399cf26c2c1ce9e96042ad58efcbbef4b881bfc33fc

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