Malicious PDF — malware analysis report

Static analysis result for SHA-256 218c83159499fdbe…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 12:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3d4871436fb627957dcbd722aced39b6 SHA-1: e5c9ddae54fc8351017c5d1244e005e01fa1084f SHA-256: 218c83159499fdbef42026e48fbed768a92a1217845320708bcf1144fcd21f77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically related to phishing. It contains a large number of external links, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection further supports its malicious nature, identifying it as Pdf.Phishing.Trojan.

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 https://huntic.ru/uplcv?utm_term=galaxy+m12+vs+redmi+note+10 PDF link annotation
    • http://arablift.net/userfiles/file/dalosunitakitekomese.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210906_BA94A7F81406599C.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/709506f7093ba8d88725e64c8ab059fb/6925518145.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/40337964776.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/labonaxijebokipulatusag.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/21754434299.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161407e22ebe69---92621532254.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/0169f5c33b140f1d583bcfa6c1f516fd/rinamojolutilavabelevi.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109132257161664.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/jifuzipade.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/lokujibibanoferojag.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/11828479337.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/26243982447.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210905044612.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210908235707.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/1040da145a525226adb9cc1034c01d06/25177187211.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/ccdc316cd9a472e3c5340131e45eca45/80394755511.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/kazupupuwa.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/41220724038.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55892001874.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/sinuz.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/larojosivido.pdfIn PDF document text
    • http://ge-mak.com/files/12543364458.pdfIn PDF document text
    • https://pindimana.in/uploads/file/96077829039.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_off0000d272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD272 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA84 18796 bytes
SHA-256: 87fe46c6713fc1e287b2e5a730ee2174b8544e5fadf8eaef4e207c4da86d1232
font_02_sfnt_off00011be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE9 11024 bytes
SHA-256: ac9f18fe87ea7687114e43b597cc69eb32082e45b246c72dfa35630d4c27973b

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