Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c72e36f76095b3e…

MALICIOUS

PDF

84.8 KB Created: 2021-07-24 13:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ed60df01b28364cd45cd04e3150f9d2d SHA-1: 9c22420abad4ecbd5f6282533955251ed9ac40a8 SHA-256: 6c72e36f76095b3e38200db186bb87c178c7fe63d0bb7f6ca392c170ddea9f19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many embedded URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/2e71539d5a54082cd0f19e9e513c458d/40805121409.pdf In PDF document text
    • http://myconnect-thailand.com/image/upload/File/37066403858.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/9658f92b2fedaf9ae43a0ef1c13970f5/84090939872.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/33466229035.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/j5nru9rb2m4gp0vjiu9v8d15dd/12355002068.pdfIn PDF document text
    • https://trunglamdecor.com/uploads/userfiles/file/1714788989.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/e9975cb7e35c1d15c0a4f91d72c6fd86/valufumesawunuf.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1606f819c8ce07---zebofabiveded.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/7170baf8769fa61436151cb007377a01/wogom.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f34e882911---waronavisivigeta.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/bacf71eb99e6ef96ff42358eed6af8c5/bileduwekizijeji.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210510045725.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/29385178488.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/95293186297.pdfIn PDF document text
    • http://biosite.ru/images/news/file/86184695403.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef0a54c6b2---16628121839.pdfIn PDF document text
    • https://agatanorek.com/files/file/80696915562.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/42255723112.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7060942b3---nodomiv.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/dl992ei1kvj25gidijq0nt05gn/67943117486.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/jrq4ur363qrqspeepkmr2hviv6/58625904751.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/78a7q71oog2i5ld222mlmdenaf/wuzixaduxosevaluparopo.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/66bcd81298e13f327ec7988387bcbdb2/riwita.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=fun+run+online+hacks+2019PDF 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_off0000e6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A3 10860 bytes
SHA-256: 4ea1a4725e12446b6f605b5a037cde45df6d1837914bcc5774533e439f62c82c
font_01_sfnt_off0000ffb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C6 17484 bytes
SHA-256: 0883ac566b56b75a782d48e9c47b660d8e42f4cf85312d1cc084f9657c287094

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