Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a1eb95dd637c66d…

MALICIOUS

PDF

130.7 KB Created: 2021-08-16 10:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b46f041e7aec4ff4ec728ff90b0f4c1b SHA-1: 7c088f7f5add1077534b255b947c4bcb9b533bab SHA-256: 0a1eb95dd637c66d702b2b92fb73b27d282d6e6f33e2e8a091c467d0d355c3cc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm hosted on multiple compromised websites, a common technique for SEO manipulation or distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links to potentially compromised WordPress upload directories suggests a distribution network designed to obscure the true origin of the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://interwork.sk/userfiles/file/golerebarapepapubeno.pdf In PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/1g6lmgqvqp0dubhi44e512q5jt/56542065657.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/te7mjt5e7eu7qspsim4adifli7/sapapomu.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/161115e1d7fcb0---kuvudumu.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/3308cc66b11140267dc32034d1e7e3bd/84081129825.pdfIn PDF document text
    • http://thelewisfamilyreunion.com/clients/c/ce/ce72a6ed4f7059d305e3bbfb121cee90/File/68632080373.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091d05e89579---jubefusut.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/38824640724.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae91bb38695---bowanidujegamo.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/71887490580.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/42746878455.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b007a5628eb---2596515422.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e1242a4db---97896809292.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/xakafizera.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/12529263052.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b813eec32e---ligasotadukebube.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20218133884480.pdfIn PDF document text
    • https://netlandschool.cl/files/26683836835.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/7d98560961db0b84e2a75052223bb74c/bezexonosinejofaxefupe.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac216f94bf8---ladopatov.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vuwazirulexopeviw.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/mefipe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72102728c1---27299099767.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/ef1cfca4d5158037f7b810ff50e3bb37/xiridavipidi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=is+apex+legends+owned+by+eaPDF 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_off00019aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19AA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2B9 19024 bytes
SHA-256: ff03035a410afb0a443420c4615fdb313c659e8ef27fe4df02bc39e9f0172b09
font_02_sfnt_off0001e45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E45E 10672 bytes
SHA-256: 2acc00fbdd92ef3a3f75309bcfc3b93c35b4b6ba146724ab40289f1ad9ef6096

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