Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dbe06b3214cfd84…

MALICIOUS

PDF

97.5 KB Created: 2021-09-01 01:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 386257793faf9da6d709d25eb0c1777a SHA-1: 1d12132dc8c3f8cccdaa09e0d4239c10fafd9ed3 SHA-256: 3dbe06b3214cfd8485cc63fff9da2779bcaca16a8d7e744292fcac8b26db9b8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the 'link farm' heuristic further support this, pointing towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://garglob.ru/uplcv?utm_term=sample+of+a+recommendation+letter+for+a+student PDF link annotation
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/2f5912a46291c578681c58a84f462c35/19881727718.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/kubir.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/vemoxujijuwobipusodes.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077c152e0957---tuwipetonanavupizo.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/sigasogokuzudosako.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/71041745647.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116c2fc78166---lonapewatufogofifusivo.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/b487a1ac85170b3fa7b24924c8c927e3/33116416897.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/lofid.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/ncjaadlt95vqg3qp2kajq0vfn3/40720736937.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/0nes4j4ksgc8k6keg2tv4igqbj/pujodege.pdfIn PDF document text
    • https://www.foundationofhope.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f068470d15---30055069531.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/17026706469.pdfIn PDF document text
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/pibudivifuw.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/80037112096.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/f40fb64cc3fdfc0c1c5ad689dccaeeb4/sorifepojeva.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/mjfpu56movp0gmftm7jn0pcc3d/70850765159.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/a4781c1241b5b1889fa264bfb93b49cf/fizuroxiwiroxa.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/mugajewoxafijagojaviwo.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/0e06038190d4f95ac70526a22a9bc316/48955027935.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5541076c09---93630097507.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/fumuwomuj.pdfIn PDF document text
    • 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_off00011883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11883 10956 bytes
SHA-256: abe800beebea203d1481a96c099394de13a4fc7eda184e2611e75c9d7a925e47
font_01_sfnt_off000131e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000149f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149F2 17824 bytes
SHA-256: cf64066b6cab3d10582a7d89d47e4378b95762df15fe1ba0434e33a0954d6a01

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