Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dc4f042726a7d84…

MALICIOUS

PDF

96.1 KB Created: 2021-07-03 06:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 66233739f98ad740d6d5e5597cc5fe46 SHA-1: fc201c1fe55df9f15ca13b00649eaf9f92dffbf6 SHA-256: 6dc4f042726a7d847d5c7c082637c7186a1706bd7ceb9db30feeffec816e164d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the presence of numerous external links and the overall heuristic profile point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://beauti-full.ru/uploads/files/65749897501.pdf In PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607afb7068124---87232126212.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/forelobefoneraxopuvegulu.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab0f90435b---37453030675.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb4050ff4a---52097826286.pdfIn PDF document text
    • http://kotolantopeni.cz/file/nerosurebopimewegi.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160853676dabfd---39028277702.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607064f4abfee---48705893898.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/sitakilojudotavoviwinexel.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/35egj3j62o27ph9td5npfl5fsr/28229987727.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/6dba9d3652f43c929a850cca06bf8e40/19519425690.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-05-28/images/files/vazavaxekisetupenuniku.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/0dh62lnje826nf9nq6fd9q8pev/63462068759.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/0920575324.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/pesiroxojavotap.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/2ae24b43a072eabd542f78b62cbf1562/93997760750.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/vaxajawamakogirugogupiko.pdfIn PDF document text
    • http://unseretochter.com/images/file/67115992193.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/tibefesigokivek.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/rizifet.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/32014a2e7c1b07e484a1aebde6cee8bd/15791433998.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2629a1de4d---55538677595.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c30f024750---dolexeboxed.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/bebufipenogusax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=is+shoulder+press+a+compound+exercisePDF 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_off0001133a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4C 17428 bytes
SHA-256: 36b7add45a7e59e5388c440fd1793744c67fc17caadfb3bb804f08b811b78f1c
font_02_sfnt_off00015887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15887 10836 bytes
SHA-256: 81accfb0e164481c693f4a09a6547a869b70c57628cd9dd03aee84b35a8da439

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