Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9e025385f6e73a5…

MALICIOUS

PDF

105.9 KB Created: 2021-07-18 14:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 68148637574dddba6d0eeadb67b0f434 SHA-1: 8253145a3a150755b671c30b9c8e46d3d6822393 SHA-256: a9e025385f6e73a58c615ddd6664d6408f221196edccd00ca1dc2ede9f4c7785
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/f8409869d8d51635cafa27620d3e5bcb/79886359872.pdf In PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/d9e5a6e5cb7bcdb4074574b9ebec0ac0/87208532713.pdfIn PDF document text
    • http://18554080.com/userfiles/file/99430449603.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e62245e0e1---30891561714.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/10ce6132e91033802f54f4de77b48e6b/tegapopazadazaser.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/mirepiruxevufukeb.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/buwojotuvefamulaximakav.pdfIn PDF document text
    • http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/muzonusexo.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/cstik24e8k3pq0qk5c8b3ksgd2/davimolide.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e19239ea2---fafasevefekiwidike.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/64302508622.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75868c23dc---lojumaxisug.pdfIn PDF document text
    • http://texmet.pl/userimages/file/13445769747.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72b27ad23d---92854154775.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/a2534b0ef58d60a7a1c656ef584dc228/52839460764.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097e88318cdd---fixujorek.pdfIn PDF document text
    • http://wohingltd.com/userfiles/buribozezit.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/mojalegi.pdfIn PDF document text
    • http://bdn10.cz/files/file/metelugesujobasezulokej.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/60054517799.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/pazetofisebajudagotejufa.pdfIn PDF document text
    • http://adveotec.com/img/file/52936611830.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c323938af5d---ponimosekogixojedigure.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/9b60be1e07d1e14f14999367386ded1b/sowubabavizapaxefokos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+insert+column+sparklines+in+excelPDF 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_off0001380c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1380C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15023 10904 bytes
SHA-256: a979bcf65333b2eab5455b9979582b71b09e4a1e8e3e6704afcdc9142d591efa
font_02_sfnt_off0001696a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1696A 18576 bytes
SHA-256: c8afff9dc83f59f847cc59fe7d50eee632f806491631ba4212239e36b53da604

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