Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e81f7d000fdfac9…

MALICIOUS

PDF

74.7 KB Created: 2021-09-02 01:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c90f474c7d895db3ca47f8038887b331 SHA-1: 2f4aba736d0a93ef444457fe60269b0dfe9c606f SHA-256: 7e81f7d000fdfac96de8069edc84b070c4a2188b9633654961f98c3454377d06
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm and was identified as malicious by a ML classifier and ClamAV. Several embedded URLs point to potentially compromised or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and contains no readable text, but the presence of numerous links and the overall heuristic profile strongly indicate a malicious intent to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://nitexprofi.cz/userfiles/file/7857118704.pdf In PDF document text
    • https://alihuata.com/userfiles/file/92315472239.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/dutoziwadisulanupodixixuj.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/354bca7af77786239f813c4974ae2f3e/tusosageku.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/45144613265.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/ravomalutusesate.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/49794383380.pdfIn PDF document text
    • http://ruihuitax.com/files/file/suxezekedijix.pdfIn PDF document text
    • https://alariel.be/userfiles/file/13081457915.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/161197127bc65e---rawenose.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/989093748.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/fb748e21e874479714cd269ba81c36c5/deruxogabifiranajegewu.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/9061924719.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/83627918887.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/3cd311eec799938c5adb5e9cf0ddc8e5/37162089560.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/90992893544.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca4f707bb4---tamabopulif.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d198fad6a78---33798574598.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/18f20658d72b04cfa948da0bdb790516/33077719643.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afc9aa198b7---pefamigi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=better+content+archiving+for+confluencePDF 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_off0000c2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C0 16288 bytes
SHA-256: 6d0a16b25ea8d1ab7e031fc93ee22658c41f92ed4439b78686362a413d66c0ed
font_01_sfnt_off0000ebf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001040e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040E 10664 bytes
SHA-256: 7a0fc69eb39751b5d6a7524b9fbe534eaf55693fcb96aa7de1350256f10ca2c6

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