Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a6e499b9bfccdbe…

MALICIOUS

PDF

91.0 KB Created: 2021-07-03 16:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5bb1521c9ef2d3072889bfc4f582d19f SHA-1: 7493ea32f591037e2a9e93360dd51bb0c53d6af8 SHA-256: 8a6e499b9bfccdbe90279318288c2fa075294c3d985db377da521b15562e02a0
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it's a link farm pointing to compromised WordPress sites, with one URL specifically referencing a PDF file. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous external URIs and a link farm pattern indicates the PDF's primary purpose is to redirect users to potentially malicious content hosted on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/9689f3e35c34f9b2b42d5422adafb134/moraxuwureliwawizu.pdf In PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/rakunumagox.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/48791867364.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160aadad3023b0---mibadetirogogixofol.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/74039cdb46eb625860463aeb46f966f2/lenekemuparu.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608623f38d72e---42761942822.pdfIn PDF document text
    • http://alexandercdg.com/clients/36029/File/xudap.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c9bf94d16---88974746992.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/3mqjehtrirnj50e2s0o7u1o592/bilun.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/9175067932.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/c4hfqtmppj9r71l99prp2utamo/suvasofimezuwibixom.pdfIn PDF document text
    • https://linker.tw/files/490146926.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/54756393633.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/fosuvezegagaka.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16095d1c68d534---bupur.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba137f0d5e8---vetagadixamarizuzuziteraf.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607be80e85408---89150205480.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210620_32C6DDA3C8278B27.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/vujabanubawew.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cf67c80c2---pumopemotat.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f27b6f3212---sukujudalejixep.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/demovalomowozuwuk.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/soduxaguvetutovonuxegasu.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/8496f8ee86ab5fb060aba80f7bb19d5e/56901376966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=warehouse+clearance+storePDF 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_off0001011a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011A 10328 bytes
SHA-256: 1890bcdefcec35022236b418591ad4fdd692b888ae38fd08c5234c114bb17821
font_01_sfnt_off00011869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11869 17052 bytes
SHA-256: f7acd064c4b3b503dd1841cf62d95d98dc45e70675362924a8614ed0e60f361a
font_02_sfnt_off0001451f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1451F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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