Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2377c989a69deec…

MALICIOUS

PDF

90.2 KB Created: 2021-09-03 10:37:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e821092c7ca3cd5e5f5baba12a20949a SHA-1: 9e241cdf33000e47588addd63b9779a08de5a8e5 SHA-256: d2377c989a69deec84205d6a59fa2715496c101dc9919869e49dd25c7e7d565c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for delivering malicious payloads or redirecting users to phishing sites. The PDF also features a large number of external links, many hosted on disposable or compromised domains, suggesting a link farm designed to obscure the ultimate destination or spread malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=let%27s+talk+1+second+edition+pdf PDF link annotation
    • http://nena-artspace.com/ckfinder/userfiles/files/sexajaverurinod.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/2717864416.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3fdcee4b5---bewudabejixunikuvaw.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/gobukivizapo.pdfIn PDF document text
    • http://dzbnf.com/upload/file///72143821423.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/piletoderenigotajej.pdfIn PDF document text
    • http://liyangah.com/Upload/file/46227303754.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/csc1sgjptpc4usdth5r7ekq66k/tumupulowudanukij.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/wixabumamorovuzobinejo.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ruvas.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b267d0b7f67---78703075581.pdfIn PDF document text
    • https://room12shio4.com/contents//files/xetofekim.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/a62d088c38d219de5b43e77ff47d2715/65660094205.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/2460500869.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/52m8dvc3f6gqb1vab23a9rt58u/ropekikisilusufobi.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810a9122ed4---fonopitipumu.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/os0thdjgdr1d8jg05o47mlr6h8/kotibuxum.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ad1356a4f---semekikin.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/1f0caf2c2a38a09b4e16820bcdd9016f/delumatimolemofikafegukid.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/fomekerigomitetezejavu.pdfIn PDF document text
    • http://xn--szabowski-tub.pl/userfiles/file/wodojupepuxawigaxosu.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/99390549051.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/184hr1rh6cmn4rgi8qrn561p81/fetoluvutujigelu.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/a1c2947048db678064bafe1ce12a9620/65795874496.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000effb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFB 1996 bytes
SHA-256: 0dc89143472c09a689f4580b638841c9aef38195d23f8302ae1ea64aeaead125
font_01_sfnt_off0000f92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92C 18568 bytes
SHA-256: eb9b5173a37183afafd905be3fd94c4708740679b7cb517e14e0a8e244212b8f
font_02_sfnt_off000129b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B9 10648 bytes
SHA-256: 92b85358baa37662d4f8684a59a042bad45faa35257cd8c430a29dc80ee1c872
font_03_sfnt_off00014250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14250 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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