Malicious PDF — malware analysis report

Static analysis result for SHA-256 763be4757cce2229…

MALICIOUS

PDF

81.1 KB Created: 2021-09-06 12:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: da314e35f3c1e1dc7cc9830c23c5bc63 SHA-1: f808c1d77651d1fcc98eeb8187566edb9f6dfaa0 SHA-256: 763be4757cce2229171a8314d8cdbf864422a74764a5a534a1eee7044f881d4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting it functions as a link farm to distribute further malicious content. No scripts were extracted from this sample, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=picadora+manual+jocca+5588 PDF link annotation
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b64084e089f---wotejurem.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa8a79ddd8---12151561688.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/c696afd98d9d1c40a325abc5da3d2f05/selovunowar.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/bujijifezas.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/b2ade0a4e9b0d31206898fbaeef9d27c/93878036693.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/26958815010.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa719ed317f---50260930744.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d296a25aec5---24873351252.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/c72d5p13pnmlpjuns8pv07at34/xulimekerajulozube.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ddaf79b2e2eb74c4a3d5371baa65daf4/vilopapemamimekonesirolud.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/pnok6g82q3la4ve33kdhbjrgi7/tatiminexetefusavaxif.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/90018301609.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210621122049.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/57837112502.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/0dd8ca16ecd9f581acd7814bdb183f09/sajeko.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/4590983011.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/48082937722.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/zatoduzedizinewedu.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862abd195df---91898833833.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c99378f04f5---vexapategorumogofa.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/7be6261443877c8d7c08d4b0e14fb7c4/jizeb.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/firilawekisuboxoponok.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160912a3aaceef---62805633278.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/73142935746.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_off0000d722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD722 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF39 10708 bytes
SHA-256: ef6f60666f90fc326434020883fab87c7a8632546e8cc69c302cc7aa46ce3487
font_02_sfnt_off000107b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B5 18064 bytes
SHA-256: e915dcf9dc81d6c87f45ffb7a5799abaadb0c568bc8827d1a09ad072d814a4ed

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