Malicious PDF — malware analysis report

Static analysis result for SHA-256 e561ab54bf44766b…

MALICIOUS

PDF

78.0 KB Created: 2021-08-15 04:29:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 36f401fe80d8e94eede47bef5eeb22fe SHA-1: 4d56217f60018a3900332493449f0bd1263c9fac SHA-256: e561ab54bf44766bb472b7de3f7d95fff0cd532c99dc93c8c4f68391a070c0a9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/6371f68878fbb05dee598c944b7e0917/ruxowuwaperuz.pdf In PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/52825384996.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-15/20210615000918398820.pdfIn PDF document text
    • http://deauville.ru/files/file/rawugugozup.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/2ce2b5f3d7b0f2853eb490296ab33de3/genonobapa.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/3fda2d76f4f68e5fa06513d93b5ff182/rejorazitusigiwaneluputeb.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e5fb46d0b2daa0f70266d176ac250f87/jitebasodir.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aafc41a1fff---kujikoz.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/8478150923.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/71980272212.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/9595970676.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c6d67a18c---67872449459.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/duxibezapunaletusiliban.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/cjqq7q96ksgop3ulmne7bvpmr7/62727435556.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/51141902337.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16102b1a08136b---wamolon.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2c4a9c327---37606782816.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/9o66so5fgmt45lodlpfucmafas/fimenobirixafakidela.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/tovatasuregidugad.pdfIn PDF document text
    • http://pronobile.de/catalog/file/kepimagovefamixagowipe.pdfIn PDF document text
    • http://americanewbie.com/userfiles/file/nevesomudafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=minecraft+pe+hacked+client+downloadPDF 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_off0000ce72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE72 10720 bytes
SHA-256: d5185d5e142a2bb2f8ec6a5f9b1d76206d56e7b37a16f8f40fd1cec7eafc19fa
font_01_sfnt_off0000e708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE708 16780 bytes
SHA-256: 4f363a6c8e464c91bc4d369617b592b8df4ae45e0dbf541ed7fea6d814236eb1
font_02_sfnt_off000112b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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