Malicious PDF — malware analysis report

Static analysis result for SHA-256 d923d83cde30f29f…

MALICIOUS

PDF

86.2 KB Created: 2021-09-07 20:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 91ea0de8d02af8476dac45e78971f004 SHA-1: f68a6832e4379ef578ede0e4dfaa106f5a25b91f SHA-256: d923d83cde30f29fca04361e7d1282e55e9485b08dbab370c03482f71167665a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage, suggesting it's used to redirect users to malicious sites. The document body is unreadable, but the presence of numerous unknown URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609871d9538e6---5184852475.pdf In PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/56073578628.pdfIn PDF document text
    • http://topas.lt/userfiles/file/32737276707.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/44821879903.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/kllv0pjc35hknm3a7qnh7e7qpo/getixupokoresolipinam.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/45006069913.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/br3tm6bnljqtj1va1nsget50ld/27006026337.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/vikomekumitepolexumipek.pdfIn PDF document text
    • http://danielbushreunion.com/clients/41596/File/xexejana.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/puxuguxakajeraz.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a40ad356a---24673021506.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/mupasosowidamixu.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/64527209872.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/88537150468.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ce8f8753814a68cf45b92dd3f54e63f3/29204312075.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611476020aa75---61674043228.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/vuzexowudanimapetofado.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/50671331908.pdfIn PDF document text
    • https://ubitanduk.com/contents//files/sufexemijuj.pdfIn PDF document text
    • https://smaransaving.com.np/ckfinder/userfiles/files/wewunopolosot.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/76488507045.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c691c1f87f---tukonunatafijotakutewefaz.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcf724af9a---23031621139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=use+case+diagram+symbols+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_off0000ed5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5C 17032 bytes
SHA-256: ade93188eb3721b53c7b05984d5bc1879671159d3f92f5147e7a0a9c55865320
font_01_sfnt_off0001199d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B4 11024 bytes
SHA-256: 95258e728e3faab0f3face28526903a44293288721d7a000083401d145c9b4ec

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