Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1058404f16fdb3f…

MALICIOUS

PDF

82.7 KB Created: 2021-09-05 22:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e11281bf60f0669174fd9df921ad8e38 SHA-1: dbdd9b7541b74731584204b5c25aa38a09678f8b SHA-256: c1058404f16fdb3f6554db8f773f106ee15115eb38ee905bc9b36c8ecf56ea54
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external PDFs hosted on compromised websites or disposable domains, suggesting a link farm or redirection mechanism to deliver a payload. The heuristics indicate the document uses urgency and payment lures, consistent with phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 8

  • 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.
  • 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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://tvtamminhphat.com/uploads/userfiles/file/sivisiziziwuxupused.pdf In PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9756495af---46862372754.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/kedovupepuvopulenulefonan.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/fatovakeligatepa.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/jowupaxifalibifegonol.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6368a27c61---pewusozojefo.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/paokqmitjolo3kdh56um77clq3/64325355787.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ddec77b862---fositotobifutumukufedola.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/2db2f367d79fe64b20d130c906224e7f/84944448723.pdfIn PDF document text
    • https://herfection.tw/upload/ckfinder_temp/files/20210701024903.pdfIn PDF document text
    • https://ipkameros.lt/userfiles/file/14535600089.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/kemamowobikululavamuj.pdfIn PDF document text
    • http://ellerbeefamilyreunion.com/clients/874543/File/39690176751.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/dupiponafixupuwos.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/gekikobudebegopibowe.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/poxojimix.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5652bcb2bd---lokepavikupelog.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/8fae07e66b59d79243082544f719f4de/taturesudimajonu.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/dddlmbgalnrfksqa826l1hmt4o/29868408239.pdfIn PDF document text
    • http://aweibel.com/Photo/file/joradinamekoxurikivezafi.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/b2utg0fhv404cao4s179ltb0ce/xeweba.pdfIn PDF document text
    • http://cortabellanews.com/userimages/pisonikijodokodakeludise.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/duvenagulurug.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/raluvelodagikedirijunawu.pdfIn PDF document text
    • http://sequoia60.com/clients/875776/File/70674120531.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/zerire.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/xixogevazox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=tata+aig+general+insurance+motor+claim+form+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_off0000dc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC78 17988 bytes
SHA-256: bc410be94ede0a169325d025856980b49681d668e47957c2d97bc011ef8ff6ce
font_01_sfnt_off00010b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001235d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235D 11024 bytes
SHA-256: 67e1bc0c4240cfad74314a4c0a7625d162c303eabbae8f9202946b849b24f52e

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