Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eef932b3588316d…

MALICIOUS

PDF

74.1 KB Created: 2021-09-16 13:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8f42584301999d49d5fd2f3a76654f53 SHA-1: 0bf8b73906857274d515792ad58662b2ecdc98ef SHA-256: 7eef932b3588316da1e214536a9f347e45b32c2531f176069de9cf0fa4c74861
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://stsmcc.org/www/js/ckfinder/userfiles/files/63479996910.pdf In PDF document text
    • https://foundryindia.org/userfiles/file/vaxagubumokixujajef.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/wazudarutusej.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/35270560745.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/dupapive.pdfIn PDF document text
    • https://finliz.lt/i/File/zinom.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/jefujokewa.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/towanasufuzobula.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/2o29oo902jei5968p8docbbgsj/ligoxozapudir.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/48949943558.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/giwalededogetiwetuxi.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/melugotovovopedev.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/juzisodigibiwozo.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/40553887107.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/78813640972.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/xadiwatumivatofitiwumufa.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/95496367432.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/23252149133.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/12853742797.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/jamopevivebikivudasix.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-8/20210908233401783364.pdfIn PDF document text
    • https://bdata.vn/upload/files/lumupigoditasuzovifutusok.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/05f5abe2087409abfbc7921dccee1792/sefobazas.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a86ec6c5d---toximawod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=android+data+cleanerPDF 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_off0000c15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC15B 10176 bytes
SHA-256: d2b4e254ce700a23e9f06cb5d3558b814ff1ddba65f67be8c12e040d80c25520
font_01_sfnt_off0000d834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD834 16784 bytes
SHA-256: 37dbc00446404b0fcbdb0b06a6e5df47c82e162f2f91b5efde972dc86c00558d
font_02_sfnt_off0001032a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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