Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef637923918d085e…

MALICIOUS

PDF

78.2 KB Created: 2021-08-27 00:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 55aae1a9d860d89c9868f79caccb6231 SHA-1: 0f00744dc7d8f1e8e913287b74fc0935cabf5219 SHA-256: ef637923918d085eec34987f14f59efcc5d8c4d2a640e8cd985c9ec90ce50e50
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 0.9978

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://philabc.ru/uplcv?utm_term=things+that+rhyme+with+sing PDF link annotation
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/76500376963.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/gubekizepilemusenusi.pdfIn PDF document text
    • https://ka-base.no/images_content/file/tosokesevotilug.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607385ab0e22b---62481016274.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/ad6eaaeb19fc0c1c715aefb269875c47/34552870080.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/puboren.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/fekenewufadipofideragu.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/waduvuzibamexamujawavoxed.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/kazazikepavozivonif.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/94658204807.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a1b6e252f---1770804899.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/983388adffcb07c8a75aaf1dc3d85d5b/zevotexiduketeni.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/99052950831.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/eff820a7a2bd845ecab72cc0f7407423/89596410200.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/pajilu.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/67561128749.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/67882128102.pdfIn PDF document text
    • http://sibservis.com/ckfinder/userfiles/files/gonotajimujezuvavinopan.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/xatipazadajo.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/jefijixirewew.pdfIn PDF document text
    • https://spacio.hk/attachment/file/filekiv.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/23412479010.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d6716b5338d---gojotazela.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_off0000ceca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DC 16816 bytes
SHA-256: 6fe982c90e7af9efcae9c3c79dd982d3a0f206bd3a0e56b18ac66f2a09dbf521
font_02_sfnt_off000112ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EC 10552 bytes
SHA-256: a01a1bea326f81f5206120a7575c1264c8e24274ec811851e9386a8d077553a7

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