Malicious PDF — malware analysis report

Static analysis result for SHA-256 4723fec797c5b26f…

MALICIOUS

PDF

72.5 KB Created: 2021-09-06 13:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d61466223ca0ed4a1053aba0601ed99e SHA-1: d4a1f01c2f39a500524f11b6fd658de646ef37a4 SHA-256: 4723fec797c5b26f31725fe59f2205929ce016fee3e3c816004a018fa68c793b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards a common phishing or malware delivery technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://scarpatti.com/files/27727211361.pdf In PDF document text
    • https://southwestlooms.com/admin/userfiles/files/xirerimiwa.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/gatiriwoxipowogabaji.pdfIn PDF document text
    • https://ortechindustries.ca/ci/userfiles/files/74505399395.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/pobudeb.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/9d058445c0c4b87b95f69449dbdc5351/ponetigipit.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/61228336301.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/gsqe9903ab7inmcb1ibra2vs05/nukukonaxupenafulaz.pdfIn PDF document text
    • http://charontrade.hu/data/file/wodonalugiguke.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/83742836216.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/61400767395.pdfIn PDF document text
    • http://christopherdallo.com/file/93088182433.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/2b1a74bfcf6eabba49c1f9ec9219e960/kiziwaperevajuvepilu.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c18bab4e118---jobavaxavow.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/rebalefesikagawi.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/kuxaku.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/f07a75726062fa621be07415489c2ee8/wobaloramidibinuge.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fd0e6dda3---771403862.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/24541346373.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d61321d589---17823368382.pdfIn PDF document text
    • https://subded.org/userfiles/file/4027794815.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/pitofuvukukulagazaxezone.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/lg7p0hs9dqokgmq47pdek0gpa5/zakafawipabodedaviwaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=sugatsune+catalog+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_off0000b6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6FF 17388 bytes
SHA-256: 49dfe32cd94245f7be76066fc2962ddbde5d341d2d1c583bdb91a0f6f7680e94
font_01_sfnt_off0000e426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE426 10780 bytes
SHA-256: d8850df518314d005d547c906247cd67c3de04d370e29a3bd50bd6a9b9c545fb
font_02_sfnt_off0000fcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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