Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b513c36bd4ef7f7…

MALICIOUS

PDF

107.4 KB Created: 2021-06-28 02:37:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 46f91a877ba0ced6277925bf17080359 SHA-1: 3573fc86546b8e2d29d654d3fa2f88b21f0461b1 SHA-256: 4b513c36bd4ef7f77671d7315bc359ea3b60e7732b93c0745956315fd4a30b03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the nature of the links and the PDF's structure suggest it's intended to facilitate initial access via spearphishing, likely leading to further malware delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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://candientuvibra.com/images/file/tufot.pdf In PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/cad2a23edb161be177ff97b85e8c5545/rewilut.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/14ug8qu10arjf754ks5p79accm/25553650029.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/mawidosikusibojelod.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/hm1bt9885ucgmsbhmg96q0r5mn/wexipinubiwisadapimenilev.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3a6c4bcc9---xepirasojotizij.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b033a892bee---28512731792.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/908f626c7c21d9fdf8977daf9d41cda7/51271830678.pdfIn PDF document text
    • http://groupkaishan.com/d/files/66270760431.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/98rn9126ntfeg5v7ol7qruv6sl/9392785897.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f26a792a37---78267457808.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083f99083421---tofekubevoxumo.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/75957566363.pdfIn PDF document text
    • http://skncn.com/u/files/73606247895.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac09ff82e2a---23249223484.pdfIn PDF document text
    • https://blugarden.eu/file/fawonilozobajali.pdfIn PDF document text
    • http://buchtel1967.com/clients/26382/File/vabuwiwobekilat.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/98144430722.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/383613feebe2af4b12618c46e20e461a/57914010996.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f603f1e3b---91044357479.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/64880819628.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607768c49ade4---43709280907.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/leputobidoxakam.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/rufufogib.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/fja11gcp17ruv71l18stebdrm0/46798881890.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/892474018.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=call+me+by+your+name+streaming+vfPDF 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_off00014152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14152 17244 bytes
SHA-256: b7d019bf94b60ba5d00ed23638b17fbbad555f4cb8e25e9c433f7321e16ee6ed
font_01_sfnt_off00016e87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E87 11008 bytes
SHA-256: 8cbf094e1222b96a3469907930f6b569533185e10bedb5bf5b9082b68831176e
font_02_sfnt_off0001882c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1882C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.