Malicious PDF — malware analysis report

Static analysis result for SHA-256 62344a8d35808834…

MALICIOUS

PDF

69.2 KB Created: 2021-10-02 13:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c8d4b8a29ed29e1f0999671c1c3f635b SHA-1: b87c1285ef37cabbfc0d0bd1daed0d71edb8a8e5 SHA-256: 62344a8d3580883488111c55b43115d13813f675c8f317d9a9b55b4075c83075
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised or disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing or trojan variant. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's part of a phishing campaign, likely delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=school+words+that+start+with+y PDF link annotation
    • https://guptajimarriagebureau.com/userfiles/file/68454465075.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/geputopiresasuronubi.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/tukatujikizirazobite.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/19352790333.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368c644f29f---29457091157.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/vaxamenul.pdfIn PDF document text
    • http://gibisch.info/files/files/88038208187.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/5505904393.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614545827c1c5---waxazojowanodudov.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/walinabut.pdfIn PDF document text
    • http://mytrangroup.com/uploads/userfiles/file/reteroter.pdfIn PDF document text
    • http://zaiger.ru/img/file/33511494552.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/kuvuwuf.pdfIn PDF document text
    • http://sapthagireesyathra.srikarpagavinayagamills.com/userfiles/file/bopabat.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/7n5mul14qqkd5qo721pet5r81u/kuvesijupumubovalisivesik.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/kirovidebevejagimuv.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613297e4367de---77156013727.pdfIn PDF document text
    • https://27061010.com/uploads/files/202109050706173132.pdfIn PDF document text
    • http://web5gstore.com/Files/files/wofatomezosevaziwuvovav.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/80978731759.pdfIn PDF document text
    • https://blv.by/upload/editor/files/12008780796.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/vaboxew.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/e3e90d21ee59481e05eb91807b7a6c74/31491422859.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_off0000b1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EF 14564 bytes
SHA-256: 39826b376795bd8391cdedcb228067feb4ef5a5c2732b8aa3886b79e8b82c4e8
font_01_sfnt_off0000d68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68F 10504 bytes
SHA-256: 8c4d2c8481e80a844f810a0ef32c3bf88a74a7baf158cf56126e37d2f2d14c02
font_02_sfnt_off0000eea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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