Malicious PDF — malware analysis report

Static analysis result for SHA-256 79f8137c57898314…

MALICIOUS

PDF

87.5 KB Created: 2021-06-28 01:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: faef492231e30d319dd2536120a9dd81 SHA-1: 6b7f21c859a65bb99f417872057a2e537e6605f4 SHA-256: 79f8137c57898314f48b9bca9348304e9d2fe971cb13df6db371f1b888738c0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous URLs that likely lead to phishing sites or malware downloads. The presence of external URI links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://philabc.ru/uplcv?utm_term=2nd+year+biology+notes+all+chapter+pdf PDF link annotation
    • http://sowa-architekci.pl/userfiles/files/busapadujozinarogi.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/nebesakenakakefux.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/50401290860.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c19df9527a8---xapanoj.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef699b4308---guwebo.pdfIn PDF document text
    • https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/70525867773.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/c5glgplpf1e6douu3c97lfiqv0/14702105648.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/a03361722bc04d8d704d063502bc30a8/nefupakozuxakated.pdfIn PDF document text
    • http://93564497.com/userfiles/verobovujazugozij.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/11852226846.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7d078adb2---kixuketunevimigavefazi.pdfIn PDF document text
    • http://adveotec.com/img/file/wupasarisifelenulalit.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/xutovewakasikisusarif.pdfIn PDF document text
    • http://xn--42c1dhzaq5aeb.com/userfiles/files/29855317961.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/suldta4n5qs9hc00tik8i1djj2/zikemajopurujinoke.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/sogixela.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/b12a51deac535b7d84279d0e58a1d4e8/82817601896.pdfIn PDF document text
    • https://press-centr.com/images/file/18275875893.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160d504ed467b1---winebojupomilovipisuz.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/nufazonu.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/ligeme.pdfIn PDF document text
    • http://garderoba.sk/images/_file/624258122.pdfIn PDF document text
    • http://mebco.ru/images/file/67319710881.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/fuxot.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/ct8nv8ih2u2hp6go7oi14p5ad1/pavetelukagokudeluneduk.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/6468684714113e93b9e0d7f336eb6fb1/7729926785.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_off0000f156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF156 11176 bytes
SHA-256: 43bc11ee20df6d26e4efea26822cc384b19b137027ff092d44a3249c4729c5c4
font_01_sfnt_off00010b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B04 17464 bytes
SHA-256: f9c5a54b7c6922703e535b61c68a8cdd2f2e0aa03941f23a6267e9cbff9d6346
font_02_sfnt_off0001383e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1383E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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