Malicious PDF — malware analysis report

Static analysis result for SHA-256 12c5e642e21adfba…

MALICIOUS

PDF

71.2 KB Created: 2021-06-24 19:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f10686777d5ee4a2847455e006a20749 SHA-1: 24a08bee131e8569eec4d1fc344cf9dce496efd3 SHA-256: 12c5e642e21adfba1ea3d6d2f9fb19dedb3afb801af70792d2ce1da97553c9ad
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external sites, many hosted on compromised CMS platforms, suggesting a link farm designed to distribute malicious content or phish users. The presence of a 'download' button lure further supports a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/fbf833e756d206d5870dd25d439692ee/74912592776.pdf In PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/621e47d4dfbb4e692b1427606109a384/13518534264.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/74407513274.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/veturukovowej.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/061a49dbc0a4896d25f8a6b618955a63/54951103456.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160860edb698e7---regakisixaxuzexafozi.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0674b5f528---sutafuduwitija.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/dofupewemiw.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607765c6762c0---11052295588.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/62051695827.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/xejerosuxebatiki.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/1765850180.pdfIn PDF document text
    • https://vestol.bg/files/file/95744325754.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607afd4888374---9419951276.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/5614638208.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/6549a6b358e24d6c3d4453693873a4cf/52203444088.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/1873843566.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8496a907e0---60189050451.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d5048b55d---teremipogi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=pdf+convert+ppt+onlinePDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1F 4820 bytes
SHA-256: 74814e4396a2962e662b2b8120673a6f83a27479bb36f5fcb59575b7b16e8b92
font_01_sfnt_off0000eda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA3 10024 bytes
SHA-256: 5427e7561cdf257ae279095aeb094d384ce32b1e93447dc6b3599a1479b2d2ce