Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b6da078cb8761e…

MALICIOUS

PDF

72.2 KB Created: 2021-09-02 21:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 087d6b6d75d144f31f194664a6b97000 SHA-1: 4bea7db6fa3fbdf6df0a4a2a8ba96241e4f66c6d SHA-256: d7b6da078cb8761e92cf8a4c0585731887369f41589c3cdd7563dd58818084b9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cnex.cc/images/blog/file/fupivabutegulitodunixavir.pdf In PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160edf30370f35---57607524444.pdfIn PDF document text
    • https://susta.vn/userfiles/file/95540025473.pdfIn PDF document text
    • http://teplospectr.ru/images/files/soripuzedo.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160f15560b955c---86423102910.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/rijorinub.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/pajiludizakunijeditu.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/21d2bc46616e2515143433ac02c25d35/lanosawabukixoxutiporopa.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/ohkk8gtmicgnelgc1kudrv5om3/16559615392.pdfIn PDF document text
    • https://p99.tw/pro_pic/files/17921366012.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/gejamoken.pdfIn PDF document text
    • http://1carl.com/userfiles/file/welononinofupije.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/26ad898a69af2dc3991b0d67f864d33a/rikud.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b889e1d9f74---43179066157.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a776413f9bf---fokebezaz.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/44955605793.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b307628694d---63690297938.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/82553028654.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3b4dc8e39---754304396.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/85901075075.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/68244153214.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/14254517479.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160eca42491cf2---97373212206.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=active+voice+to+passive+voice+converter+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_off0000ba3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA3B 10616 bytes
SHA-256: 4d46fdcbe591a1e900f73ac07d81ff5b9d524697eeea40341189f00f8cacc28a
font_01_sfnt_off0000d2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACC 15840 bytes
SHA-256: e7d69aa9f295987f67d4737d1bbe88829f5b22bdd4b2d2334e1a444b89e6e760

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