Malicious PDF — malware analysis report

Static analysis result for SHA-256 f26ad8c2838a96a1…

MALICIOUS

PDF

94.2 KB Created: 2021-08-01 09:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7f57cb5ff01177f414a1d37c725042e2 SHA-1: cf5e487bf86b236d4176bf9094ece9cffc565e50 SHA-256: f26ad8c2838a96a154f23efdfe2c0e3c9d325e28b294377db86566b982eebf68
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. These links are likely intended to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://normel.org/files/upload/file/doxevatumubefunek.pdf In PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0c4078492---93380167926.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc37d06185e---76649314544.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/clf4rlqv18qb832iunhbmp599u/12059194576.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/66426561042.pdfIn PDF document text
    • https://edbcagliari.it/file/nidasovubexofujo.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/4c0ec5ce90cd0ea3be47561589bfd40a/79256698919.pdfIn PDF document text
    • https://nadinerogger.ch/userfiles/files/dedekidopuniru.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/mnethhnkr32hohidksllkj8021/9697891228.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/43a1f6e6d8dbf64b4526f30ab84e5561/kusaxirol.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/a0pd3gmdmqtgn5dpptu7p3u3is/65017884431.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/sapelafutapawu.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db45703675---82133355063.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/dbe74f2314cd07a31da254b361053792/loxasugitikikidi.pdfIn PDF document text
    • http://webursitet.org/Files/file/84948429411.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/fifitubuxu.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/jegamuwa.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/jajaderozetezomokis.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/5e47ddc433df769c1492335a2ded18f0/95964979599.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/22528943910.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160753e31c9949---78855712306.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/3cb968e7e6b4db86818ae781e805e926/kemimodemokijopokuse.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/84395fbd5aa0eeef8a2bbf3530c2f188/95598247211.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/duzuxotalijid.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/rabopavufopowoli.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/5458171386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=the+real+jazz+solos+book+pdfPDF 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_off000109e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E3 18016 bytes
SHA-256: 70f8bcf1962dc7c5947881e895180ba90a4c549c4ad4e5206be84d7cd954a2ed
font_01_sfnt_off000138b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000150cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150CB 10684 bytes
SHA-256: 0a917298bcdccec248a52d6dfc7cba40735b9a3ff22d353c9d4725ba6b1f9587

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