Malicious PDF — malware analysis report

Static analysis result for SHA-256 092c5bd68ea3ded6…

MALICIOUS

PDF

69.4 KB Created: 2021-09-25 21:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4fc1e0b7c943d6f15f7eeba4d59cfd5b SHA-1: 26e2fbcafbe068f5a5c75cf13d4776f38a213302 SHA-256: 092c5bd68ea3ded670f6bfd9eb684582274ed2d1934368c1a69418b6a9d2e561
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. The document body is heavily obfuscated, suggesting an attempt to hide its true purpose, which is likely to lure users to external sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://kimandyoo.com/userfiles/file/65523542373.pdf In PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/nridbutkarjrdvi4hh50e6dm64/71119317883.pdfIn PDF document text
    • http://labsshop.com/d/files/jidor.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/37089176372.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/69666245496.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/vuxelenulafeniperi.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/94167550373.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109080819234395.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/20109087929.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/96518046675.pdfIn PDF document text
    • http://cobmedia.hu/include/44914311965.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/kudavodapokerus.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422b33e30c0---dewofug.pdfIn PDF document text
    • http://bergepkolcsonzo.hu/userfiles/file/rodoxosibibukowabin.pdfIn PDF document text
    • http://yztools.com/images/upload/File/nerirovixuxo.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/tajogaxok.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/wumiweziteridowe.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109020337574896.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/161472550cf5ac---vetepizuvob.pdfIn PDF document text
    • http://compsult.net/userfiles/file/65082156262.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/11072326597.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/23091065500.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/89296317282.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/jinekasowefijo.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/pekelifajelurinekovorori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=pokemon+top+10+games+gbaPDF 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_off0000b05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB05D 10764 bytes
SHA-256: 999272650bd0cc5e0e18b9ea986a0932fe608a876380ff6bde64b2f65dfe200b
font_01_sfnt_off0000c904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC904 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE116 15576 bytes
SHA-256: 7304f2a02143b7f0ccaab3b212ec236aeec731e4fac7d6cde3cfa810748c8994

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