Malicious PDF — malware analysis report

Static analysis result for SHA-256 83aae1fc03480c5c…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 00:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e1cfe01f8e5c4ad600f9759862910103 SHA-1: 7022dc2d5466aea404f541dfc90a0f6b46a8c0d9 SHA-256: 83aae1fc03480c5cc5643263462cd13f54c491849aee2b58a87fc904257e33c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple external URIs and link farm heuristics points towards an attempt to lure users to external 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://rotitelor.com/contents/files/65898803318.pdf In PDF document text
    • http://paulabenveniste.com/UserFiles/file/6617314652.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9fc48399b---nirunivobotumedupidowofa.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/99523729101.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/2025694173.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/53158623465.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/ratiwodowofusu.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/75352971482.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff1605bbea---79752965494.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/51524054666.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/81050018598.pdfIn PDF document text
    • http://kalikraft.com/images/file/kesoz.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/3521546891.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/liwewidakolu.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/kewizabowozozezuvo.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/xewexadevixapamo.pdfIn PDF document text
    • http://szpk.hu/_user/file/97178905907.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/5vacn4ad9vrcdursomsj6bc5lr/kidozux.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/bofuvup.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/jemetoxase.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/ribavafabinivoropuba.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/budodowudugawadopug.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/dujinabekos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=shinobi+striker+apkPDF 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_off0000d9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F5 10608 bytes
SHA-256: a8ca6b7c4de94a3a1f261ae8491a537598e5395311a124cf4bd5768c92aa202e
font_02_sfnt_off000109e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E3 16936 bytes
SHA-256: 83819fb400a7f6115035d92afb35701eee9c30cfaf19307c2bf2e29e345aa028