Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3620afc04cc5e8f…

MALICIOUS

PDF

87.3 KB Created: 2021-07-25 03:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: df5665bd21ea2a44e54ac5b324d0984e SHA-1: 3ac20a6b94974d2f12bd1f8ff3b04ceb393a00b1 SHA-256: d3620afc04cc5e8ff9849c309c848afb2eb566488d1ca344a493bc5f7ccea02b
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users through multiple compromised domains and disposable hosting to potentially malicious content. The presence of numerous PDF link farm heuristics and embedded URLs supports this attack pattern. No scripts were extracted, limiting the ability to determine specific payload delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://instalacje-elektryczne.net/ckfinder/userfiles/files/67150410637.pdf In PDF document text
    • http://pnmanagementsolutions.in/uploads/39603329319.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/sunuragizo.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/sudidopujufif.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/2ffec8578d6604f1009655a94197c0bf/68022830446.pdfIn PDF document text
    • http://sequoia59.com/clients/867919/File/59693411383.pdfIn PDF document text
    • http://stananddiane.com/clients/6/67/672a2699e369d648dd23e03de9deda78/File/12841745248.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/fisonarorefed.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079936b5fbc2---suwosugobiluwulefelomi.pdfIn PDF document text
    • http://atya.eu/files/file/23186427546.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82763e5196---tokolufigabimumofixero.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16089af5a34aaf---3699074837.pdfIn PDF document text
    • http://thevenetianmask.com/clients/71561/File/77135320233.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/826602a5a1e9acaf68782b58ffdaa7e1/jirulutepojovakanozowol.pdfIn PDF document text
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/89969451676.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d2bcb982fc4---42175256383.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/870a6d00ff81b0fbcba4d1b7dd90daf8/9448785991.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/b9775d87684b1f584a11280ec1489580/81617906896.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada17c03974---7741229166.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/virofodijiset.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/nubuzexinegeton.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=full+bass+dj+remix+song+free+downloadPDF 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_off0000eef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF7 11136 bytes
SHA-256: 7a466ad26d486f10920d87506f532541d4c8ebafdf0e6e62e8b754208a04205d
font_01_sfnt_off000108ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BA 17368 bytes
SHA-256: 26c44beb62b8c7e007d6d3d0cf709e41911262e9fde660efa5f6da1fdf85cd7b
font_02_sfnt_off000135ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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