Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd4d9a8b68e434cb…

MALICIOUS

PDF

91.5 KB Created: 2021-07-09 04:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a1d6a5100955d7bbe859083305ed2e0b SHA-1: bacd6f6c81f671c7b7f51aff37e998f7c2651621 SHA-256: fd4d9a8b68e434cb5ff095a259554dd1df997c38a7368b8bafde0143b30a8057
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://riondene.ch/img/uploads/file/mibonaz.pdf In PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16086bb747897b---turozixumumulepujebik.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/768c4947688785ee1d23cd11271d9303/puximepogudaxojixan.pdfIn PDF document text
    • http://incucinaconalberta.com/userfiles/files/kopakosisuma.pdfIn PDF document text
    • http://suapaiatuipelehakefamily.com/clients/80707/File/wisukesulodikisaxonajovo.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///58337438607.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863a163f1b6---nonejobo.pdfIn PDF document text
    • http://abnicum.com/files/file/lizofenazonizepo.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/kotebironaji.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d886d7d0e4---28195124163.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/n7a3avesrhtq1obctufvo1kuo8/17395576861.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/faf09e925ad43a02e33f2d359401dff4/didipupapigoj.pdfIn PDF document text
    • http://gilbertthomasreunion.com/clients/5/5f/5f56fe696be94dde62972871c8a9bc28/File/luvewitinekuvawul.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/towif.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a429f1ee7d7---27194944764.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16077cab516d96---sojijuwagunuloz.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16078ea4d81be8---togagazumalesafenujitu.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/nuzuluwonujewiregosevaka.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/db09ba451ee9518f736dbd5f33c38f94/bolegabafufixevojakuveji.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b023045e0---35035088237.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/rozoz.pdfIn PDF document text
    • https://retta-bg.com/userfiles/56184742681.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5c4263edd49a1e7b49a0d06c636cf44a/85710911304.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=good+things+come+to+those+who+wait+meaning+in+tamilPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012d28.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12D28 17308 bytes
SHA-256: d8b7301a39287bb478df19bb62a66fd025be395842f48920e8ffd14596926847
font_00_sfnt_off0000e3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB5 19500 bytes
SHA-256: 0242f5b3c7051f4be91d0bc1ab1666474c949bc3d92bc1041e232aa7cd80543f
font_03_sfnt_off0001472b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1472B 10840 bytes
SHA-256: 67bd51cccf200b37e1135fa4fc36a42d1be4583b5903f33ff335ac211cfc8250

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