Malicious PDF — malware analysis report

Static analysis result for SHA-256 da3ad4ffd64ca051…

MALICIOUS

PDF

68.8 KB Created: 2021-09-25 12:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e0b91a891fb8157012eb32c246fa99d4 SHA-1: 6c869bd23ce92ac65f7dceee58bc025df5923cec SHA-256: da3ad4ffd64ca051a9d38e7571819d1b98aed4a03c1e695ca4f18bb19951c23e
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, forming a link farm. The embedded URLs suggest an attempt to direct users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://crysiq.ru/uplcv?utm_term=how+to+unlock+developer+options+in+mi PDF link annotation
    • http://proxima-design.cz/files/file/ruxogexefujotemolavujela.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/15be4482b34e6a9d7dae0eb2e0125cfa/gofom.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/kikusupeti.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/t1fbhsg6mht8m8h3mdj5rmo7md/fikitagove.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/1137583519.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/15241831203.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/f4da356d3103ff377670e2f1a2999e19/gigerig.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614965d1193ef---penuredezez.pdfIn PDF document text
    • http://leguido.net/files/36778949586.pdfIn PDF document text
    • http://eichler-kammerer.de/62907613463.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/vurirelama.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/69063410114.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d079ded566---28675736410.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/jiwasoxo.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/katigekopumega.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/27642122739.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/linajuxegiwobolojito.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/xiraposofiwoxasowerono.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/54626528865.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba37879712---sobil.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/jojevivatufomapajigilope.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109120828222021.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_off0000ae4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC65E 15308 bytes
SHA-256: 3ae00681d252884ea2f1f88ac001d4b99d67ec3913b798147cab6291b912c38a
font_02_sfnt_off0000ecb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB5 10848 bytes
SHA-256: 0ae8d4af82cbaa6e6d395d538a00e21b051a81fc1cd75960f7d427e9eaa693ee

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