Malicious PDF — malware analysis report

Static analysis result for SHA-256 68ac4f9356637081…

MALICIOUS

PDF

71.8 KB Created: 2021-09-07 02:14:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 75f9688652cfa288d22aba8ca40f0a93 SHA-1: 8ef28a034b0c08e67fdd20a34dc7ea4de99e2e7e SHA-256: 68ac4f93566370812d04e34a23fbee2482171dc838ce0196d4e7124f168b645b
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 0.9909

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://queure.ru/uplcv?utm_term=fikrad+ganacsi+pdf PDF link annotation
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/c81e5548050abe3057667dd91cf04607/20661086664.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/10884640062.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/dujedizagapizumetebugul.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/40071045284.pdfIn PDF document text
    • http://uamarkets.com/images/file/kiremexe.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/r5v9kut62npo5epkcor6tjettf/95264817963.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/23462141199.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/44fc1a68c1685adf2852294adf6cdf67/30048634343.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/kevudasimudatetisi.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/76301278269.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/rupibovigazulijuzivira.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/66899951800.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/xovugasowoli.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/74752193947.pdfIn PDF document text
    • http://aweibel.com/Photo/file/xirulezifexejugoro.pdfIn PDF document text
    • http://timebymtm.com/upload/files/28327008796.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/a9d409806ef2b02039d9ca0103ec5795/72610854610.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f8757edb7b6---51881404269.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/gse31endqh7cud12akv894sf02/38310073121.pdfIn PDF document text
    • https://capecoralliving.com/media/file/46847599238.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e394ecdff---buwidofaka.pdfIn PDF document text
    • http://www.yt333.com/userfiles/20210727/file/1627396990.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/5113122735.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/36527070720.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16098b26176f2b---42368013142.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec62abbf71---jasasovoromegeniwom.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/18855702873.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC33 14948 bytes
SHA-256: 9e63625fdb2e9703266ac1bf1538f5d5ca0e2f5b243fb7ef6a4bbcb1d9c6aaf1
font_01_sfnt_off0000e1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A8 10468 bytes
SHA-256: 3825b94cb13fa3d7dd71ba5b5952918512110d8da16d2c4309dfe9b2e3e8702f
font_02_sfnt_off0000f945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF945 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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