Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e4e0246a834dde…

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 15:36:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef5486514e660e292becb65b61e8a9db SHA-1: 4a2844d24d9068f8d56962f6e717be5bb8182f9f SHA-256: 41e4e0246a834dde0dbee1274a4ff28f3237e41d0b7f4c8a2d16657547f408f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm intended to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the nature of the URLs and the PDF structure points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=minecraft+redeem+code+free
    • http://bfcy88.com/uploads/files/jupovovod.pdf
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/remenabovefudawixuzalun.pdf
    • https://tumujerrusa.com/userfiles/56297480312.pdf
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/69921644670.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/6cf0e1a03e1b2b4e43d3d1405bd5297f/maxokenesobivosozeba.pdf
    • http://grubstreet.ca/ckfinder/userfiles/files/96373920211.pdf
    • http://agro-partner.com/Image/files/21936482997.pdf
    • http://claudiamelchior.it/images/file/77324964361.pdf
    • http://childconnect.com/swi/fckfiles/file/49659405696.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9a982f646---13434865426.pdf
    • http://thaihotelsale.com/FileData/ckfinder/files/20210911_386C6E11D01E8146.pdf
    • http://haiannweb.com/uploads/files/korobef.pdf
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/bonozuketojew.pdf
    • http://thietbikhachsanvinhhung1.com/upload/files/nirodululedadan.pdf
    • http://eaupureinternational.com/userfiles/file/kakubebaxosero.pdf
    • https://dp-engineers.com/admin/userfiles/file/62354149643.pdf
    • http://balaton.varosom.hu/userfiles/files/kufodozaribupukofulogu.pdf
    • http://teraval.cz/res/file/bepofuzulisi.pdf
    • http://klawiatury-foliowe.pl/_data/file/92853779221.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a63254553---66916400125.pdf
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/wonunanaribojimoxa.pdf
    • http://abwingsva.com/uploads/files/93133862905.pdf
    • https://morabia.fi/images/file/22881306427.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dda3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA3 16792 bytes
font_01_sfnt_off0000f5b5.bin
682e7a8d17f3bee21c04a578ade2f7f67444b7790b5b5e71ce8df8e1003c63ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B5 17216 bytes
font_02_sfnt_off00012270.bin
9a58f541ba7856fd526d451f431fc9a03f56f678533c47ce1feb3003e7ef9f18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12270 10416 bytes

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