Malicious PDF — malware analysis report

Static analysis result for SHA-256 1102c47324c24cc7…

MALICIOUS

PDF

81.5 KB Created: 2021-06-10 18:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: f7c03aacd9fc735c46237e0f9cd7da93 SHA-1: 547c2f24a86454555639a6a449e492778cebd62a SHA-256: 1102c47324c24cc71d6a1ac91fc81a12c4f8f2c1e829fa32ec1fc98effeefeb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The presence of 'utm_term' parameters in some URLs indicates a potential SEO manipulation or tracking purpose, likely to direct users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://synerhu.ru/uplcv?utm_term=pubg+best+sensitivity+setting PDF link annotation
    • http://cestovni-postylka.eu/userfiles/file/lelenexokeben.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/b3d650f156af41d27e4a46318abb3a35/21783455463.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/f6889275c8c00f138180fd14ba77b751/jetejunovifuduwaduf.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/7f534c421efd2eba61f99ece1ab04748/tujadajap.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824dab80a7a---gobutilizivowavuziniwibaz.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8273b63e50---najotoganugujuz.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/53f91c40a80ccb4f78b060c93b1f3830/resalisizezekazukani.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c17406d2b---sepeju.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/43b977ab46adc3b781795eb4e1c768cc/64426905875.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/wafumunowiwofegu.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607182c7b19a3---ropamutafiwifivopifezovi.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160899fd602087---zanepupojumu.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/kadusonuzaxuze.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee28c69bb4---vulirisu.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/bepimuzepakobad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE07 4588 bytes
SHA-256: b45ddbb59fb117d71bd2b183e8f47c1dbce5aa95154ac112f0d4280927baedbd
font_01_sfnt_off0000edbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBF 11136 bytes
SHA-256: 06c7d9abd16372952728536f3a205e33dd692757328dd061e9e5ff818d779a35
font_02_sfnt_off000113b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B6 16168 bytes
SHA-256: dcc437beaabc532c244cb2402c7e187dabb6fccd34af89cd9e2270a2a4498d3d
font_03_sfnt_off000128bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BD 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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