Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d32af92111873f7…

MALICIOUS

PDF

88.6 KB Created: 2021-06-19 02:41:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: dda195576c4bb403a51a7219c56605b6 SHA-1: 9cd5abd2b6835a3b3179cbe02fe679fc06b0d4e2 SHA-256: 1d32af92111873f7d9eb69b4e25d83c2d6e20ffedaaae97c327fabcec601d8cb
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://synerhu.ru/uplcv?utm_term=all+the+bright+places+de+jennifer+niven PDF link annotation
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a50bba9c7---78932078466.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/d56d6f04f9243d18c0408bc3582d17a8/97032107578.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072a14163097---foluvavutufako.pdfIn PDF document text
    • https://kham.vn/userfiles/file/wilimilozelobasizoduzurud.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/3b7f1fd692ffcf2435aedb48140e60db/17712871433.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f530e2ff79---49014819356.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/1247207605.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a3f933108---74208405178.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/gofimazojura.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/eqkd6kdh7nk12knj67kb8200h7/nilojunuxapo.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/82021560352.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/91779402096.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcbcf23fc6---76963314165.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/dumozuxilopuv.pdfIn PDF document text
    • https://beaszemin.com/files/janigugivabibanaxenux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB37 2912 bytes
SHA-256: 852916b1f10e9ebab6554572988742e720495013e78e26a509fc48c43b69d01a
font_01_sfnt_off0000f58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58A 5360 bytes
SHA-256: c829b99ff60f317053d4bb9b31e227ed47c3651415decf86ab2cc4d878940d46
font_02_sfnt_off000107ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BA 2920 bytes
SHA-256: 3ce131d32ec6dfd61d4c92e026be8b898fb56e1b965188f1235628eb960de326
font_03_sfnt_off00011350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11350 15588 bytes
SHA-256: 6b99a7d2c48facc15e7d327b8df7246ea8d3b9206505d00dd4ee718fc04c33c2
font_04_sfnt_off00014462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14462 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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