Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed5082b65f7bb04…

MALICIOUS

PDF

87.8 KB Created: 2021-09-07 09:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bdf7f8945cbaf805386bbd9675fd8d6d SHA-1: 51c09de8ab02da86c94fc456060919955b5bfb9e SHA-256: aed5082b65f7bb045797a288cdd63b6e9f9ade4e42ce9db2be105b36c8e475d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://allytemp.ru/uplcv?utm_term=music+marketing+pdf PDF link annotation
    • https://ringid.vn/ckfinder/userfiles/files/sokixomevafiluxagegil.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b86f8a38616---1195647658.pdfIn PDF document text
    • https://sainaudit.mn/File/92046087690.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5c9f80e23---zotakorater.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/96487170138.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/36237170710.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/dozipazuwema.pdfIn PDF document text
    • http://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/finikixuneguwarafesamub.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/b91b7cc776e2fec4f14fd81954ed3669/91133537327.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611406a13a55a---subuzesijukojeru.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/relibalotejogagitofapegaf.pdfIn PDF document text
    • http://ciskmv.com/css/file/72832492124.pdfIn PDF document text
    • http://shopabrang.com/images/files/tojanetobeleli.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/5eb1965ea6caf51c34c62afde513594d/93558573681.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/37586643464.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/2483760017bba01304046bef263cf5d5/noruzewusokiwesinu.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202108200611448022.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e23b1a8674b---fimexugazivag.pdfIn PDF document text
    • http://tele-video.ru/upload/files/kagegawolofudiwog.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/30f73881c7a98f4c516fb0bf4e2f28f8/83572998775.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/tebewukonufux.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_off0000f21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21F 10984 bytes
SHA-256: f8dedcfd1edb307ed5e71c0f825825e69876d90d644121e3f217602aa01023ec
font_01_sfnt_off00010b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B72 17796 bytes
SHA-256: b9085b7c69267073fcef5a473f1d6a740fa21dc4f87fe8d2dd469c7e862eacb2
font_02_sfnt_off0001399c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1399C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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