Malicious PDF — malware analysis report

Static analysis result for SHA-256 997bfaf6f8336621…

MALICIOUS

PDF

70.2 KB Created: 2021-09-18 19:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ef3f6f7b51b8bd21e16f475a0ffa2db4 SHA-1: 8774ef6c91e5cd6204b2f6dcd184746dc8bb2939 SHA-256: 997bfaf6f8336621cb92a412b874c8f685d25752af4c988851a9362800eacbef
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to compromised WordPress upload storage and other potentially malicious sites. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest an attempt to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/161371a7faf9a7---58745191127.pdf In PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/domesalajuxaludafufi.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/wetutur.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/rudikuginegasilabe.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/bigaf.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/bexun.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/g0lnmd9c7mm1b3coub3h8do6l0/deweg.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/kesut.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/jivuzebemaxugazox.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/bcde1c7b4fcaaa6ea1c73bd95e7a307f/60561558624.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd17d7ac49---fekasolexegedonij.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/dijase.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/xuvimovoribogazeku.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/gomevuzazibetozobosor.pdfIn PDF document text
    • https://edgecs.com/documents/86104323490.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/37092466205.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/84826254852.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/15233115069.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/zuxogetopegiw.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/rinobojikinikabozojino.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/neruzugadiva.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/futajisudiroxumebuvug.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/94098504593.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=fruit+ninja+game+for+android+free+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2EF 15296 bytes
SHA-256: 92877fb23ed17f5d61dfa43602079329132d6c8f130abc614e9b4a3d4d71578c
font_01_sfnt_off0000d9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D8 10824 bytes
SHA-256: 441311d2510b0728e9c747a8cc5080e05e759f561a74b0feea5d19a196c10726

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