Malicious PDF — malware analysis report

Static analysis result for SHA-256 63b7121c7e303ffb…

MALICIOUS

PDF

85.2 KB Created: 2021-07-16 11:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a6bc4bf6d69689ba58616dfd76f0dce1 SHA-1: 54b71ccb80802f4dea6944b41f25c104ee2b51aa SHA-256: 63b7121c7e303ffbe168b288adeaf7c04e9ee25250ad04f71a08943395b0c557
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://wastran.ru/uplcv?utm_term=administrative+officer+interview+questions+and+answers+pdf PDF link annotation
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/291499046e8781489a100125b5034bef/69853533560.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/44517300806.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/23162525416.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/7rdm058q0mlu8fs6h71uc0d2r7/5847169223.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/64659233123.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609a11e6a766f---jutomesumijasimovenatinu.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d9a7de89337---lijenenisu.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210613114347.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/80339380d3340cf595323808336c3904/bejajedinamilojiloz.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/a395b06ac505ca688929393d173cc372/xugutifakijora.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/pukojuvuzupunexibosewubu.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/99302822427.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/gadoxiranotisemin.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/86508623789.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aad8f4cd6bc---8750993918.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/6489171911.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/jolanaperawenub.pdfIn PDF document text
    • https://tantecoccole016.it/file/vadabupunarajanefiwudum.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/tunazomapefigofinis.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/gulutozoziga.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/rc4755coffh89h6l8m3skqlpne/sobafofup.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/5450647e234c7506938f9d5e89cf8685/ganuravifove.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_off0000e922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE922 16972 bytes
SHA-256: 0e643ad10177ec5f88f15a5c1bc7f300321eb5246264c2a40b684063628293c7
font_01_sfnt_off00011517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11517 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2E 11116 bytes
SHA-256: c5b37b8594469dda877a28171829d76fa87724977528ec204c6c48b6c3860543

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