Malicious PDF — malware analysis report

Static analysis result for SHA-256 6597feb392777355…

MALICIOUS

PDF

91.9 KB Created: 2021-09-15 11:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1465e3489f943571f1ed73c68e5d970f SHA-1: 509500a5dc0c0ae81dc5a71936d2edca202da91b SHA-256: 6597feb3927773557f52a639b901605ded53bed420c000008aed9828af9cc40f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. Several heuristics indicate the PDF is part of a link farm, with many URLs pointing to disposable hosting or compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • 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://delfosventures.eu/userfiles/files/viwedewevugizugepo.pdf In PDF document text
    • http://sk-massimo.com/js/upload/files/wajanuzutorawexaxekegewev.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/balufezijamifulukifek.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/75369056884.pdfIn PDF document text
    • https://dellrein.ru/content/file/44700422965.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/rafila.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/qm124vf08qrhqqteut69vlco25/varobesarafevif.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/lozilukutoxugowerizud.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/ruxebojaxirugab.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/26921728569.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/dd07ff64e275c48c8c9892ea922bdb49/jadarogowezigoxomob.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/35236115332.pdfIn PDF document text
    • https://heyratacademy.ir/file/kudenagafilodojazanixus.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/gomupuno.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/ketilokegazomubapi.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/gnkmdpfg0vfkr0mpvr4p7vp0rc/minodugedefuletunopotamal.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/43021116021.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/96646465175.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///wumapidiw.pdfIn PDF document text
    • https://iword.de/userfiles/file/nunubudepevitokivuzafutin.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/wolivadisotugi.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/kugimakolowozuxix.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3cd776b04---20895312411.pdfIn PDF document text
    • http://teifsepahan.com/files/file/36447694795.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=free+convert+xls+to+pdfPDF 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_off000103c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C3 17708 bytes
SHA-256: 143986f2c9dfdb118f381a7c30f1d2a4cb13ad7258c22fcd9a08be71dd640c75
font_01_sfnt_off000131db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131DB 10504 bytes
SHA-256: 6534dafff7917d68d560f5faecb81cb5f5886e31139aff3bc4374a91abdb7c0c
font_02_sfnt_off000149e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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