Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed8c58098d3d91ca…

MALICIOUS

PDF

86.9 KB Created: 2021-07-16 01:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c9d077f7daac989355e6fcaeabc258f5 SHA-1: 65760e6c433e3f83a8246ad109b1e84e81fb7060 SHA-256: ed8c58098d3d91cad95e880892d6ff54b209db6137a55f68e10d1bd59bb30c6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://alnahamgroup.com/userfiles/file/46058158039.pdf In PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160ecf167e2119---25314074592.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a59dc58107---ketakowufiboromofedex.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/96289440132.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9926541026---fijalekejowijuxozujudozo.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/47458317758.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/9fb421914ca8aa1bdae8d0ed95bbe6ea/lumaju.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/736240297c80ea3978cddae6b633e184/jetesi.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/75361355320.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cda47c053b2---9247082057.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/86301953922.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/verovukotaludefobokuvedun.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/213nb2f5b18tukc1sh70cp3r2c/81241866793.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/nixagiso.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/vijokuriwik.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/66fd05d8814cfca0a1e5178967af8ebe/22936775437.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-7-10/20210710185230272918.pdfIn PDF document text
    • http://ashioke.com/images/library/File/81502499761.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa37b17190---kewozifaduvusik.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/62159860063.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/38276701921.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aea2b5d774---tewudosunube.pdfIn PDF document text
    • http://hsiwww.com/image/files/20210714_140037.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=life+orientation+for+south+african+teachersPDF 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_off0000f330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF330 16816 bytes
SHA-256: bced65cbdf2dec09925145fc72906ab46ae98eb382ea41335822f3405768fd21
font_01_sfnt_off00011e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9F 10444 bytes
SHA-256: 0580cf375eeefe1525a1ad8019295e5b6eb029f0cb330cf36aec068ad064e725
font_02_sfnt_off00013647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13647 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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