Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b18afa4bd973bae…

MALICIOUS

PDF

78.0 KB Created: 2021-08-29 16:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 54864a6e1387a89df0c45bc933b30d8f SHA-1: 3a76bd7b3f0f25526bc05af627d19519b7d8c771 SHA-256: 5b18afa4bd973bae1ab5a84de42b432c29bf82b5ad6be22f4df3d5ed35f52fb7
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS uploads. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://auxerretv.com/content/public/file/64734040615.pdf In PDF document text
    • http://liavanhaeringen.nl/userfiles/files/tezavojudatifek.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/vosapajewobupipo.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/66422395162.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f196e8c2c---biduzav.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/tobotolififuwunazobev.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/8583087731.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/20218251055488313.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/ba73bd833765dd5a7943522561cfc41d/71242502260.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/gaxepifawamobabodamap.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210714024303.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161263b1ca0a1b---57725700172.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/pifuxigigekoxavagorob.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/rurarisaxodu.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ceb970a5f---lufimovebagubovirasuwi.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608b69df99dcd---57187467396.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/9de3b4c82d98e5a6eed3d2f131d510bf/fuvovutu.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/70557923064.pdfIn PDF document text
    • http://aven.su/userfiles/file/52775162392.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/86314255884.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/e4cf3add855c4abe4e72f1c4980c8df2/11405531537.pdfIn PDF document text
    • http://daydala.com/userfiles/file/mizurabekelukepesogipefag.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/55071929243.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=acls+practice+stripsPDF 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_off0000ceda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDA 17392 bytes
SHA-256: 69cdd226bca6b5f2b982f45f9852ec388f06e51b0c605fe3fa6069dd7a390699
font_01_sfnt_off0000fc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001142a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142A 10124 bytes
SHA-256: 4ec08eed6118f323b865bde1b7752589c09f1dfa3630a73cc79748f2650fa6fa

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