Malicious PDF — malware analysis report

Static analysis result for SHA-256 26640ac9559602d4…

MALICIOUS

PDF

87.8 KB Created: 2021-08-11 21:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9a5335e0082dfe327c9aab382fe15b8c SHA-1: 21d2ea6fb10a450d0638f76cd63983425f87c42a SHA-256: 26640ac9559602d4a794ccbfe2ba01c9f23fcf24d4438d90fe38133059f943a4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on compromised websites, suggesting a multi-stage attack designed to distribute further malicious content. The presence of these links indicates an attempt to lure users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://candybeauty.vn/upload/files/wulavabesapeninujebos.pdf In PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607b29291a9ce---50084163479.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160e3e1b058763---zowezup.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160be38dabc39c---22087297268.pdfIn PDF document text
    • http://agiteam.org/clients/b/b0/b0c4817036ef1cb73596cc935f3fa86d/File/83264952642.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b9a50ab92---55052988671.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/zijeteziwomuxomemufira.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/7c99ae4f67cb1ee8ed6b4c5a526abc2c/75163940658.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf7e9e288---24287815638.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/ukuimamit9fc6p8ccibeqoo1r4/79741268524.pdfIn PDF document text
    • http://builderall.info/userfiles/file/47716436181.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/2e5a4644d8f31fa179f3691c0882afaf/47966446453.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/kesinadisajurujibotarozof.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/42df162f45e2cd8e723fbc66998b9430/32355902873.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075e6fd329e1---31983985612.pdfIn PDF document text
    • http://toroisg.com/public/images/files/1335838932.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d92eabd0c---63162135710.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161129e5d93ad7---minixo.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/h48aak6dg3t8v9paggeiiktk43/53438812660.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/47411116707.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/bilulanuje.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/9881042131.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b2b32c1b3---juwixezuviwunaposoxuwiba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=honeywell+thermostat+t6+pro+series+manualPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF254 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A66 17192 bytes
SHA-256: b11ab7d514d98aea01e10d9e12939330b38c3873fbed3dfc7141c72848b3e6cd
font_02_sfnt_off0001371d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1371D 10976 bytes
SHA-256: c00a25cea7d5746aae15fdc8e02a41ac78fa46c1c4312ddc0dadd2f0d1e8f7c0

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