Malicious PDF — malware analysis report

Static analysis result for SHA-256 58a5c6693be94572…

MALICIOUS

PDF

85.9 KB Created: 2021-07-28 06:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0c25748d053b5037cd3908e3c41d46aa SHA-1: 39c9fb6533b7d65a6685c79dae2de198673b8293 SHA-256: 58a5c6693be945724b35d8bf703776aaa37d7d8cb453abd8814d1e4723021b9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to other PDF files hosted on compromised websites, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/62633451c8a4218941a4cc454ae6854b/wivavobozegimufokitizazu.pdf In PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/1af282d70520a1a9b5aa42cee41f8726/84840781181.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f1eb37223---32107215285.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/06/files/210605193851.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/58195769783.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/c93767eda0783a80771adb4c26fea3da/zasiriganosavuzuzowilulo.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160799daf05d79---19884300183.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/totolatapagufejizagewi.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210703100238_zw49ra.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/24309784567.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021070722431134.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/40086137121.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b38cfddbd7---wozitanuropibigi.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/49f5n0690o5bs8j0eqcnor1ttj/japukevomunukitub.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/cf9b9fdfe64534c7544cb2ef7cf82679/sezejunerukuferoz.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/82021613977.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/32719670899.pdfIn PDF document text
    • https://sapporopools.com/contents//files/29264536988.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=new+headway+beginner+download+pdfPDF 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://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_off0000ec8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001049e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049E 16688 bytes
SHA-256: 1e6155c235a261dd59eee95285d24295348645d870ea44c550ee189b86c53f14
font_02_sfnt_off00012fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB8 10828 bytes
SHA-256: 6508c87e084314ad9044ebc1a832885aafdab3de8bf1a621d4ffdcb67b7e4f2b