Malicious PDF — malware analysis report

Static analysis result for SHA-256 066374a2e5f8c025…

MALICIOUS

PDF

90.4 KB Created: 2021-07-08 12:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1b5bd114fd6b722974050a73810f9d78 SHA-1: 9a8c648b06d21200d1b94d32bdf9840f6916f815 SHA-256: 066374a2e5f8c025496c001fd64a886e8bbfb232c5e3e43d5d9a3682b05706e3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It functions as a link farm, containing numerous URLs that point to compromised CMS upload storage, suggesting an attempt to lure users to malicious content. The presence of multiple links on potentially disposable hosting further supports this phishing-like behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

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://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2b103d214---55912071464.pdf In PDF document text
    • https://best-label.com/upload/files/24996226386.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/91252631232.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/32269333769.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/15180274e6218954048e12bd0428fde7/mikofogigoleluberizikij.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/26705018375.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b122570a781---xoxevatalibubinav.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/ginufuzal.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/90706663428.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/gufafofemilolededusu.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160861fe8d3498---49475279850.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210630_8D94DB22FB2830A9.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096c5347936b---62878679120.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/38adff55d04ce1c491a48da9f4ae7bf1/91831104789.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/visozefi.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/b59534edc0d6b1ba56c6cba2d3f16176/79638379998.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/kiluvokobupamow.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/8e1d7d562c9e36ea1e668cc9c6cdbf18/13031307913.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608c22f78d914---72904643485.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824b33d6e8a---bimizemavimulirunonanori.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/viwanerubutu.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/wokivarosubemi.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/47305969387.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160744b7d3f09e---zuxopu.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077b6b49b1b5---juxol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=definition+of+aphoniaPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000eee6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEEE6 18328 bytes
SHA-256: d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
font_00_sfnt_off0000cad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD1 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_01_sfnt_off0000d851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD851 10144 bytes
SHA-256: cb05641f6f99b0f22fbdf01bc56eea99d13224d9d07c5a436691ebca2a7daa53
font_03_sfnt_off00010c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00012499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12499 22308 bytes
SHA-256: d0efc5a58af580917821ea7428630f86587d001ed15e6602346b795c8a48e247

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