Malicious PDF — malware analysis report

Static analysis result for SHA-256 b49da01c9b4c4d06…

MALICIOUS

PDF

84.3 KB Created: 2021-09-23 02:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 43f28c3298e0b8f257fa6b3b17c0c773 SHA-1: a16cd08e94c955d89df377c70c94ba9239fe5f8f SHA-256: b49da01c9b4c4d069e36785e31f5ffee60c55a3362ff6aefa1d92a5d7f038c99
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=unblocked+games+plants+vs+zombies PDF link annotation
    • http://espressobuilders.com/app/webroot/files/userfiles/files/pupozinuruzul.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/60242743123.pdfIn PDF document text
    • http://space-edge.com/upload/files/kojowenadibenilibabemotug.pdfIn PDF document text
    • http://beiks.info/public/file/60525038315.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/67049048681.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/9916920353.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/2e574451367cc705effc83774129c294/78017111374.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/vafuwetorot.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/9408456628.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/24633955766.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16147d39366025---37533916736.pdfIn PDF document text
    • http://dnepropress.net/files/file/45567872865.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/53648937143.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/99621709432.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021091118174173499.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/17890226946.pdfIn PDF document text
    • https://hse.tw/upload/file/negofoganemofebeloguput.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e452125a07---redesosumozituze.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/4150a7eb6464c7917ed943616f75f695/mizijujogatawuxowavokag.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/bifapimerarizemu.pdfIn PDF document text
    • http://notarius.jurist-info.ru/uploads/news/fckeditor/file/lawedovopiwejodadij.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/22037598203.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/25500661973.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/51283552171.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1614224ddced60---zexozizebu.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_off0000e06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06B 11124 bytes
SHA-256: a5c5f7fb22cacce8c7c38800c57618cbf938e37820cf2a09180c7c5ba224a302
font_01_sfnt_off0000fa03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA03 19244 bytes
SHA-256: d4554e34f8d4730e3d11f1f9151105625018d95c6a40cfce850320efefd96146
font_02_sfnt_off00012c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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