Malicious PDF — malware analysis report

Static analysis result for SHA-256 552e56e3f5b5b03e…

MALICIOUS

PDF

93.3 KB Created: 2021-07-03 14:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7158a9026ab8936c04e65c4709cd7fd9 SHA-1: ddccb4b218816fa177308d5fee1c1707d9593ee4 SHA-256: 552e56e3f5b5b03ed974dbde877bc79388ddcfab2b73e03802902963713c2fef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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, directing users to multiple compromised websites and potentially disposable hosting, which is a common tactic for phishing or distributing further malware. The presence of embedded URLs and the structure of the PDF suggest it is designed to exploit user trust by appearing to offer legitimate content while leading to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/2ed6a758ee8a2318c25b0bc4964f734a/40520443314.pdf In PDF document text
    • http://texmet.pl/userimages/file/gijuri.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/eee6872d3048a27c8f4af4251f911a54/35353367521.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3351ebf41---42384317990.pdfIn PDF document text
    • http://delve-cr.com/uploads/52085477545.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/ganorixewa.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/92639811877.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/vulunajotawepuwex.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/e67e24fd098afa12ea19cc6d07fe70fc/moxiwulaji.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/21828690731.pdfIn PDF document text
    • http://centrons.com/uploaded/file/170505378660bb36e565ab7.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/0f5a22c86adc8b0022845f84f05f8445/wubulitopulim.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/33146abc8e82007b575ba8ee936b71d1/gogozonudob.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/5q4bbgpksommkc1nu2bngkpts7/sovakigajew.pdfIn PDF document text
    • https://buka.ru/sadm_files/58060221882.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/ruwega.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608f69244e321---19312139058.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a949801b10e---93109585721.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/hlrnog7729qhnpu09m1qs4rpmp/dabanikolekezirogi.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dec757197---28146838091.pdfIn PDF document text
    • http://whatdwellswithin.com/file/jagataz.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/72947817788.pdfIn PDF document text
    • https://menu2uplus.com/images/file/97533065158.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/jawup.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/4420ec7642f6c595c420418aac61c2cf/18399228098.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=fraction+word+problems+with+solutions+pdfPDF 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_off00010611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10611 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E28 11188 bytes
SHA-256: 65018834e98e1e790c9c91a2863728fe7862609395358cbf7e646834cdce374e
font_02_sfnt_off000137f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F7 18344 bytes
SHA-256: c675184d3818426504d5130622d1a10824b7e04845e3b3f8fde31d22c2b08abd

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