Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f335b55002b0b8d…

MALICIOUS

PDF

69.8 KB Created: 2021-07-18 20:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7b95119465a0c80427ec213385ce5f50 SHA-1: 8a165d8de1570083030f3a2017d5def55ac465f1 SHA-256: 5f335b55002b0b8d2dfe4aa03dee693a379368f77e96ba5498ed8db4d411d937
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various URLs, some hosted on compromised CMS uploads and disposable hosting. The primary goal appears to be redirecting users to external, potentially malicious content, rather than executing a direct payload from within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/7dae8803520beb54fdf90769c7f816d5/zujaxifalojonanudutesido.pdf In PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800d8728899---28241840980.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/f2fd72ca373374aee854fe4657c5e552/69330734738.pdfIn PDF document text
    • https://synersys.fr/contenu/file/39865776033.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/64703048749.pdfIn PDF document text
    • http://diamondsnspurs.com/clients/12200/File/fusoni.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/sapazoxavur.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5170885b11---lupiwoganatojiban.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/tuwixofinep.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/19091244672.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16096503990fc6---39886058275.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210703/file/16252676555901.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/4828179500.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/44108281636.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/lidotevixilugajeboje.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/farezipul.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60cd9d3bc5---vivinako.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/vl8400c9fseobadnk1sq1ul4tu/56234148762.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/87638867866.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/4479b738237d016139bd4dc678822785/nizirenal.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/xewegef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=write+a+program+in+java+to+multiply+two+matrixPDF 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_off0000b0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F1 15232 bytes
SHA-256: 0f717ba5a561dbc0f9e725fafe801867648b74fa90394a24c26d11da6f2b60b6
font_02_sfnt_off0000f02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02A 11020 bytes
SHA-256: 2822a275fc1631fa35c86feee130b203a192facaaf4c2d5c8e55d592b503d4c0

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