Malicious PDF — malware analysis report

Static analysis result for SHA-256 33dc21929695ed68…

MALICIOUS

PDF

78.6 KB Created: 2021-09-05 00:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: eb7694fcd920e555fa27efefb29f3868 SHA-1: e5308eb2ff31ef1db942b3726f439f49ce13083d SHA-256: 33dc21929695ed681f362c43da9b333ac1243d05fea3d0a25ae811ffd79aa952
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDF files hosted on various domains, many of which are flagged as potentially compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://xosobacninh.vn/webroot/img/files/33930882837.pdf In PDF document text
    • http://mazdooradda.com/userfiles/file/pefotu.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/jamodi.pdfIn PDF document text
    • http://englishkan.net/UserFiles/File/29504936017.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160760087c1ea8---xobukonifub.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/karuvituzadabizakavuz.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/n88b7ctbqdfnti9oc3ft1e26l4/58103936376.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a341e9db1a7---xexevubufuxuluvuwibeg.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/xilixisanevuwani.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/61159857949.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/34751842319.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/9lhloorc9dtrsure3v51b3pl03/litamaluluriferupagobi.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/nalepukorinevolido.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/75339785448.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/sagajomikoroxunokuvisi.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da05fe0a86.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/35176864308.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/12227637678.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/vegoxaletokametulukuxase.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/fmj903prder4au5oj7oblgkdiv/valapevokokejow.pdfIn PDF document text
    • http://winso.tw/userfiles/file/sanivorenejafimo.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/b84ktlpc77j5hmbmhfv0t706l0/84338533227.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/77276817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=essentials+of+biostatistics+in+public+health+3rd+edition+free+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_off0000ccf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF9 11112 bytes
SHA-256: bdc98dab8935866a2aa196a32b479dc34d3d854b22a242086b8152ec4717c3e8
font_01_sfnt_off0000e69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69C 17648 bytes
SHA-256: bcd10c6bf5b7a33a01eaf266f37a9f8d324aab49f9e655805de55009e56d9db2
font_02_sfnt_off0001141e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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