Malicious PDF — malware analysis report

Static analysis result for SHA-256 f88d37c2ae51c33a…

MALICIOUS

PDF

74.2 KB Created: 2021-09-27 06:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 97b1c8d2ed06ce753bc91756abba4e79 SHA-1: 19d50d75edffbb45ff988254fc2ed3f4c38b2a73 SHA-256: f88d37c2ae51c33a82d806c407d7616229dd74b37523b0b8510ad8465966174f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The heuristics indicate the PDF acts as a link farm, directing users to compromised CMS uploads and disposable hosting sites. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vatlieutaphu.com/upload/files/30446997806.pdf In PDF document text
    • https://karthikaspices.com/uploads/file/zexagawisukafig.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/20734872536.pdfIn PDF document text
    • http://synfarm.com/upload/files/66732948427.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/koteforufemogukexojezala.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/30279571328.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614b529cf16b0---fadenatotokovapepukuwel.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/63801631982.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/36b526ce368873176d718839eef19bed/nupatutidufelawujobu.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/39948491363.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613032a01d726---rutinifimukakepasep.pdfIn PDF document text
    • http://tartak-monis.pl/tartak/images/file/98030532663.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/kixijorur.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/92095848889.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/16994775747.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/xezaliveja.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/piroloxitupetez.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/42900231590.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/refizixerevamag.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210921022150.pdfIn PDF document text
    • http://surestegc.org/documentos/file/divexabijamozudoluw.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/75041986531.pdfIn PDF document text
    • http://tano-cable.com/d/files/93871682223.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/81063964336.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/53634435769.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=on+java+8+bruce+eckel+pdf+downloadPDF 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_off0000b4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B5 11104 bytes
SHA-256: aeaebf60456835fdb33aee427e40c85b9a34756b4ab53e44751d9e49b9a768f6
font_01_sfnt_off0000cea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B6 1868 bytes
SHA-256: eb0341211c53bc2e7b22986bc6414bf7bde70d796497497dfc757e6bd4ef3e31
font_03_sfnt_off0000ef75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF75 16572 bytes
SHA-256: 904938f5d3284879f4084006dd176ff841ba6ca96a9520fd70fdcbcc78a3174a

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