Malicious PDF — malware analysis report

Static analysis result for SHA-256 653a1f9e623086f6…

MALICIOUS

PDF

81.2 KB Created: 2021-08-10 19:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d1005f5eeca5ad037b87e70bfcc03238 SHA-1: ae47c12a368d6486b5e2416598416555a8857672 SHA-256: 653a1f9e623086f6edefaf78044fa45e85b378726dcc79bbbb124f035bc97ae2
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The presence of numerous unknown URLs hosted on potentially compromised infrastructure supports a high confidence assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/9f688ba977ea3892b618be4bd64370b1/nofolutujeresi.pdf In PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/86070291994.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/98436367893.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/a4c760b16b29c861d42a73743aab4553/waban.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/vilepidexizovulavizikekan.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/60d90df99d872a80d2ba33fdc6843cb6/16375193173.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/3743f80abf35447eab457c016ffeba64/4235259656.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/bogorogilopodo.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/csou2cbuib1fsj2nksk4fu92t0/16577979500.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/siwogifagixumodivikerarul.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8877744897.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/cd6ceac94cd06689c58e123492cef562/18636851204.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff3443cf1c---37844920589.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/23821024465.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/07aa3b7a44d667e8d41b9a9d8000f505/27542624068.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/90606306368.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/luxedijapezoduwazepi.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/b321687ecdb5134d9ee1c1e5815bf3dc/bexexiv.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dfdu3gl12uaqcehvo50j6cdof1/pakumorotevoxuderij.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/d00b50431e4fd3a7a73b9372f676d7d1/vunoxixojimawapesurozaz.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/petepu.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/dupivalefomubenoguputuvij.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/50313613091.pdfIn PDF document text
    • http://liddellgaryfamily.com/clients/863293/File/makezi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=le+cirque+des+horreurs+barcelona+2017PDF 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_off0000d746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD746 11056 bytes
SHA-256: 60570f53319286f29ccbfbb2fbc3072ecd3a3ddc67b76de6031c0f44e98d879e
font_01_sfnt_off0000f0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C1 18788 bytes
SHA-256: ce0948f0c8ab18824f3f14e4d25fe98ad425d18152027888de349616a556d0ff
font_02_sfnt_off00011f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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