Malicious PDF — malware analysis report

Static analysis result for SHA-256 7734271a5b4d1dbf…

MALICIOUS

PDF

90.4 KB Created: 2021-06-27 08:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d850d070a3827b2a8caa4139a2f4d86f SHA-1: 2b229cc263d3e039e8e253d3e65a30913501f829 SHA-256: 7734271a5b4d1dbf11540ab4ba14ce8a8c2fe18bb62c8edf589697c7d656c7db
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. These links likely serve to redirect users to phishing sites or download further malicious payloads, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://oniceh.ru/uplcv?utm_term=flights+from+los+angeles+to+white+plains PDF link annotation
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/019036a1e922e36e70347e4d3788d7aa/rarikofufijuk.pdfIn PDF document text
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/18808986532.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/35576001633.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d39dc75a3---90696155541.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/xakoreb.pdfIn PDF document text
    • http://jar-ted.pl/file/80826233764.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b95ea0eabd5---mikat.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16092016801f44---2126855914.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0febbc3db3---dududolisomebetaridot.pdfIn PDF document text
    • http://vce34.ru/attachments/file/67879354693.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c903bc500---31858610861.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085bc92ab17f---73228120507.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/lakupojevuto.pdfIn PDF document text
    • https://wecareprogram.org/images/file/jabivoxovemutife.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/rologufuke.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe750cfb75---bokapujivizuvugopibu.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a6004e42ddd---16134410107.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/566bbf2b976551018c66fecc26e5ea1d/vesokalu.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/j2ll1p8jr217gu8j1515su20t6/16769690441.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/c8f0b0ea634412a9c0d44544044c7fc1/liriwupexakujedufara.pdfIn PDF document text
    • https://mkontakt.pl/dat//file/kakixujekefabugile.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/p91o7m2tah4d2tv8gvqvib6602/filobazekibar.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/kosalugabilat.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_off0000fb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1D 10868 bytes
SHA-256: e66971a54393b793382b555997a6d1e91e6805cf096c27d10ca6884198e20bef
font_01_sfnt_off0001140d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140D 17788 bytes
SHA-256: 9ec50ec8f8fc3fd6f1c3b7e02bce0ed1b9efdfcd87ef63b7947fe363637e32ee
font_02_sfnt_off0001426f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1426F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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