Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8987538f36e8ff…

MALICIOUS

PDF

84.4 KB Created: 2021-09-01 10:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6d7a4eed1e29e45672c4d74f8b0acb3e SHA-1: 10fbf09df28bc3c1b4cf104d2bc22ed098595272 SHA-256: bc8987538f36e8ff281de4007ea2705e68d4b626941f799b1756ccc3e9bacea0
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and URL patterns are consistent with SEO poisoning and link farm techniques used to lure unsuspecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://inwebjor.ru/uplcv?utm_term=thermodynamics+laws+with+examples+pdf PDF link annotation
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b269fb00274---potonit.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/ba887478a6f44d3155574a76499d3e73/73726023136.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/71579393534.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/ribifopuliruvisut.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/11525843478.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8804ee073d---11967450499.pdfIn PDF document text
    • http://scoopsites.net/userfiles/file/76746874801.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a6dcb4e5671---1007837551.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096dd54c1252---zajabawigudapux.pdfIn PDF document text
    • https://retta-bg.com/userfiles/67022861891.pdfIn PDF document text
    • http://smitheaster.org/clients/861344/File/43484947315.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/70348467932.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160da64988e685---ruriximatedudat.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/pukosamidotasaje.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/tarosev.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/zezefexiwo.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b81a8079f59---denizatusupetedebab.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/91f3179d5dac0c2dcda256a90a0ddb9c/rasudofetujo.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/0c9a6b6bf602906cc5f0ebc0c76d12d9/81355901761.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/pafejefo.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/leseloxegodugi.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/73918440332.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/d4feaf50087bfef570151efba718c81b/xegafapudarotolidot.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_off0000e1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C7 18092 bytes
SHA-256: dc75779119e757307f569d46328e5f5f6bfcb00b531f51e30afacee422b261f6
font_02_sfnt_off000128d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D2 11148 bytes
SHA-256: 9814acbc21653ec1deddf8965d2151fb7ef8a0d79263cbb6cfb22a1f9f3cc5a5

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