Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e52bff45f44c27c…

MALICIOUS

PDF

89.7 KB Created: 2021-06-27 03:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d1bc32486afe349957eecfe756b51747 SHA-1: a2ef8757930bcf5ffc6b10d1b434cb0fea504aba SHA-256: 7e52bff45f44c27cedb7fd89c65c2280cf35471b0bce2611f82f843f453e1398
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the structure and URL findings are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pistant.ru/uplcv?utm_term=prince2+foundation+free+exam+questions+and+answers PDF link annotation
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a72c279e35---9168258817.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/veburijaxotedexobig.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/vvtd9p233n5a8274uq5k2t0en7/55110502952.pdfIn PDF document text
    • https://loctra.net/userfiles/file/73361347370.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/84025808761.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/rojanezonawutilola.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/8pvgb0iim3m8dg569p1mgs3s54/99136859005.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/26634503836.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/0f76eacd27614b4df25f4dc3b33574c5/gokubinanawavufamoruma.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b3ce1c988---46291464671.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/459ae2cdcdf2d891acd63c19fa4cf59f/wuzitozemagi.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/irvrj8ltd9i9kbfmbq29qi59k7/dizupemuwawesosu.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/688ee60e88c9923ce48148c2d4e7d564/29563960611.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/75cla8fmfkp9s0k80ispk4d3d3/35991927402.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/0843befff9b2add09a07ffc735c2fb40/19768667451.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9f068a9a4---97090251199.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/12ffa700360d5d0d33439c6febe3df6f/kajobutowobozuma.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_off0000f836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF836 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11048 18724 bytes
SHA-256: 30510d1d718b023c41462e9aad7e5100caccb22ac65e24fa29320068ac9f1ae8
font_02_sfnt_off00013fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FEE 11148 bytes
SHA-256: 741589db496f4d33aa758cacc2bfdbe6bff1ed4eba0788faeabc57ac7d781898

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