Malicious PDF — malware analysis report

Static analysis result for SHA-256 050ae75be3302b49…

MALICIOUS

PDF

74.0 KB Created: 2021-09-04 02:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fb1bc7fb102bc8d01b4a0be7e3a334b4 SHA-1: 673e19b7b8fbaf99d956b8c6becba412195051d2 SHA-256: 050ae75be3302b492b08f51ac6a75acc7032fc71750642845ece1c41ea28bd48
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The primary function appears to be redirecting users through a chain of links, likely to a final malicious destination.

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 https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/9b01f7501b406c7929431bad794b9092/66385356134.pdf In PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097a28b692d7---25419841048.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/97265568442.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/vavimavijabimemutifitizi.pdfIn PDF document text
    • https://electroagro.es/pub/files/vasuxojuki.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/d3b9b37e87ec0c36696c2d4e79480983/detezadiwudegutoneko.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/48182368659.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/sazunovoserog.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/780570728.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/noxisojatikug.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/f12731ba9dd68a54e00e100e47c99490/93938919604.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/nadigipibex.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/nezeke.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16079702c643fb---bononatefiwosoforud.pdfIn PDF document text
    • https://qualitymattressfactory.com/admin/userfiles/file/dagupe.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b97022180e5---20602558292.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084d411ec409---1486819039.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/sipotoninurifopavis.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/3591aa33f59c1d4e76651bd3d25c7a21/rubeduwurabox.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/gopisupariralovosagobuvad.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/46574ce3897e15dbb6ec26810d300604/40906760898.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079b2ff95d19---52115435052.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/kulafipabagizetazog.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/rirexatenube.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=passage+narration+exercise+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_off0000b91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB91E 10852 bytes
SHA-256: 48b4118b8350459d05be287c8345b6524503c8738af75fc6c46e66df9dc88e2a
font_01_sfnt_off0000d226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD226 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA38 18364 bytes
SHA-256: 2be6ac5c95555d80f4b338b361e952d020bfc81fd96333fb424008aec371b569

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