Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f2688f75e0d448…

MALICIOUS

PDF

83.8 KB Created: 2021-08-12 14:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f50d803de4ca4572f10e45da4fe88462 SHA-1: 05df069ed5866052e0f69e289f675bcb584d4167 SHA-256: 56f2688f75e0d448c8afbaab91d7b685d8d7f78db46739ef49e4b5f9ee636717
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains a link farm pointing to compromised CMS uploads and disposable hosting, indicating an attempt to redirect users to malicious sites. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of numerous unknown URLs strongly suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://virus-safe-zone.com/ckupload/files/gipegexerumasomob.pdf In PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160984e19728be---wixudilalefufededotatuzob.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/0k1r6tp9blkjbda0c4p20ltna7/jedemodofejoraxid.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/noliraxedinugevupimojug.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/56508884109.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/1e5c98cb290b28ae6b3cbb968d0866a6/25863248291.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/52035499459.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/99321952914.pdfIn PDF document text
    • http://platcometals.com/images/file/guvuwojepiza.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d7567c5a3---37583848781.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/65691719106.pdfIn PDF document text
    • https://mfdesign.hu/files/file/96937887880.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/megeviwofuvafupapov.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/xopazepukubavudasem.pdfIn PDF document text
    • http://moawin.org/editorfiles/userfiles/files/zejeru.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/ronavozapovaxi.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/xejakoruvokiwokijufilibul.pdfIn PDF document text
    • http://rc-modeller.se/images/file///30191642475.pdfIn PDF document text
    • https://mzlpro.com/web/img/podborky/files/goxojomadane.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/palew.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/36793813161.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072084ad2909---setanefepo.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cec11749fe---tasodelumasazapaxisaji.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/tezovalifoguge.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/99079210039.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=musica+gratis+de+los+tigres+del+norte+corridosPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD7 16944 bytes
SHA-256: ef0329dac4803480f2d6f4d9e9c4ba3aed2817dbf0857a17f9b8becfccd91a33
font_01_sfnt_off0000e22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22A 10640 bytes
SHA-256: 60024519e0105da16315d6399973734ebf4b0b610dfba331b9a7a1e0ed18d91c
font_02_sfnt_off0000fa79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001128b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128B 18072 bytes
SHA-256: 394c421b203803797271926fcca62bf7deb9ce72269f768374e1f896452e61e7

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