Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a03c5dd5a11e1dc…

MALICIOUS

PDF

93.5 KB Created: 2021-08-31 02:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f15996f0ad1f306ce658ca637d03f81e SHA-1: 5aef9e953142134068561c5df34ec37b9d1cafa0 SHA-256: 6a03c5dd5a11e1dccc219861e2c187d48c3aa4c349fc8e0ef6ed076b17874edf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous URLs pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of external URIs and link farm indicators strongly implies a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://irlanc.ru/uplcv?utm_term=take+out+your PDF link annotation
    • https://shieldtech.cz/ckfinder/userfiles/files/mimirudimatigegizesajuvap.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1c1306d95---gadinifudubegogoxenopa.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9768da2c4---fadonad.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085edb116860---82215974439.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f91a15722---tisajiwuwudonosowakot.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/3dc20bd984b896ae9724badafed5fac9/fivigebupo.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/vofaf.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/58280831124.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/162a575819297f22318ee6856fc97a87/87690672.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/nobafirexosop.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/96498832094.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/75078037870.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e0e86f9a28c---nopozuvoxusuwodorefisuj.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/85935149150.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/27560945620.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/tilumunemivupafojan.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/kpnigf65ur5l0isj2popmkh3h8/50486830592.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/wujipesatobajatowale.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/lt9c9obqv6l2oca8viuog2moej/lolefawibanitonujufate.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/8193092764.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/282cae6a14b2f8ef70119af8b4ec5fa0/37187061523.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/67620989866.pdfIn PDF document text
    • http://gptools.net/userfiles/file/7274223783.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098c30549428---42997958490.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/84242ba05a9bda6b636cd9fe1641b064/bowokorar.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/baxovarijupaxudabu.pdfIn PDF document text
    • 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_off00010b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B09 18892 bytes
SHA-256: e17efd47a3d94992794655f3db1a01300c7d575ca6422b94518c52d9d0ffec04
font_01_sfnt_off00013b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15394 9960 bytes
SHA-256: 2561d1e83a2fe8404cedae42e4e59a79dddb7fd8d103c027c58ded991b5348be