Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7aadb9ea102c849…

MALICIOUS

PDF

76.4 KB Created: 2021-09-24 22:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b3d7c0ddb7f972339051f8ff8896ccf5 SHA-1: bc2fea35ddde55138f2dfaddc0f3fbb95cf17bbe SHA-256: e7aadb9ea102c8490d8a9024ae3ef5473da3800283b2495053d091aaaa6ca6a2
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 compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://queure.ru/uplcv?utm_term=watch+fast+and+furious+9+online+putlocker PDF link annotation
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/3vc4m5pd1h8r9dpl2m1l7fbqu0/jotinose.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/vitomonajabafibumixi.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/38991113157.pdfIn PDF document text
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/52735254974.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/zulexusila.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/pewapab.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/rovep.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/tusunamuvokawatexaporefed.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/bedodawisadax.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/kuzubovawozemu.pdfIn PDF document text
    • http://3q1p.com/upload/file/210908111639181376ge0kmgr8d2bg.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/wikuwov.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/43853425444.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/64655637171.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/magojit.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/3123342615.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/161343fb8a2c3a---32777592227.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/78615937271.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/558b3308db2cf228b69cc850586c4868/21866594771.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/63087750052.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/83523321278.pdfIn PDF document text
    • http://chongros.com/userData/board/file/nikafukudejuxatomujuxazi.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/kofonozalanuxolitukiz.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_off0000bffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFD 18540 bytes
SHA-256: 953f629c38a5ee3c834e79c9263669817e1fc5153f0844b654c41aa979384740
font_01_sfnt_off0000efbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D4 11072 bytes
SHA-256: 3d305739fe1dd9add6b72e5ed429b4a4def05bca781749c68b2d5c8bf8c7fcab