Malicious PDF — malware analysis report

Static analysis result for SHA-256 932eab85475dedbc…

MALICIOUS

PDF

81.8 KB Created: 2021-09-01 06:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e4a40c3e170d8ff2517c10e93187aea9 SHA-1: 35b1d594b786eae1357716871a27f699c46597f5 SHA-256: 932eab85475dedbc861c299087ac05f4fda5aee6cdf793e660ad2eae8e538189
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous links to compromised WordPress upload directories and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish for credentials. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/b6852ab4e55dd7519120b051134f33cd/ligezodutebekujumuti.pdf In PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/ccba8844bd0230285922cdb87a9588f9/medamudeb.pdfIn PDF document text
    • http://plusdesignwebsite.com/userfiles/file/53823783818.pdfIn PDF document text
    • https://giustofiori.it/file/lezobukaxozije.pdfIn PDF document text
    • https://bataretak.com/img/files/file/14393620536.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/lbr8rm31rpj01u8b3a6kvqejph/witawizinuxifi.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/54132863605.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/057829e34c02db77a703c5fe560a63cd/sibegesenus.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffc6cecbb6---wovijutajirabefirukoxeda.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/vixami.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/55439580467.pdfIn PDF document text
    • https://groupunsur4.com/contents//files/wulimodowurikukego.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/5739568039.pdfIn PDF document text
    • http://gibisch.org/files/files/92534945533.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/89718197477.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16109be4b028da---65626343768.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/lanixufotuzapinube.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/55f6eeaf429e747f1278cb1516d6de6d/44231560952.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610452e673ebe---nabisinojogi.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/60495465461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=watch+out+watch+outPDF 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_off0000d11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11E 9864 bytes
SHA-256: 32323b3e3a654ee6b5c71ad6cc0d8b306b2bd477c6a0328e68293d31c8e08514
font_01_sfnt_off0000e710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE710 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF22 22716 bytes
SHA-256: a9058358595df2cc124ca3e12e6c93416364344e498f38f2b46cc201fd5b0415

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