Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e774dfffd46d040…

MALICIOUS

PDF

95.8 KB Created: 2021-06-30 09:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2408869b7379a859becb7c74e8c39397 SHA-1: 2187172c4df97987f7a18ea8704ccf7963c2207e SHA-256: 8e774dfffd46d040c476ea76ba49890cf8bf8beb1192dd24cc7d7fa90c01b192
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating it likely exploits a vulnerability or serves as a phishing lure. The presence of numerous links pointing to compromised CMS uploads and disposable domains suggests a link farm designed to redirect users to malicious content. No scripts were extracted, but the PDF structure and embedded URLs are strong indicators of a phishing or exploit delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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 http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/vs0vnaoevptkcmb051418m1p91/xadodi.pdf In PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/f016d0d08e8aa27617faebdb7d4f874a/zasuxubedudunaretefa.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/10535037588.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/5988ca5f12c76e87c4ff1fd7361b50b9/jaxuninim.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ac69ec9ad4f---ruwabiporeb.pdfIn PDF document text
    • https://adikkedua.com/contents//files/dotinozekutuzi.pdfIn PDF document text
    • http://mvhs1964.com/clients/2/20/2030ff4f331b14c2016b95997514b7ac/File/jerinud.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/97a2f39aa31acdc6e7b89100ee7adce8/90429278469.pdfIn PDF document text
    • http://aven.su/userfiles/file/16164379307.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4680c1253---87669630272.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/d157a8c436fc3deac636f99b83f18b69/zepodor.pdfIn PDF document text
    • https://bloomeng.com/uploads/vagidetadelajowolusi.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6f6a61840---16893266531.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829f595f9e8---14383074657.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b536ce9a2---zexifuma.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/82329738322.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/23429796188.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094094112efc---nukazobulafutosedududuv.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/e55u4ngh8pgtaaofo0a8obuui6/vajoxudumimajisemajiwoze.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/0cc7oaeoagrlsdkkvltf4m8kac/mamurazajivufupalub.pdfIn PDF document text
    • https://langestrand.se/anvandarbilder/204/files/70547926493.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/54183765881.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/safamumurijazedujife.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9209358539---zererilizijarol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+add+a+character+to+a+cell+in+excelPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001079b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079B 1996 bytes
SHA-256: 9eddc3927f8d33c4c0613d72e0f5789c86d42ec39385a9c7c34aeb387daa9392
font_01_sfnt_off000110d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D5 10480 bytes
SHA-256: fc87bc10a59684b66c74344aeea312b20954dcb045d6a83018441694cc668cc5
font_02_sfnt_off00012896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12896 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000140a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A8 18288 bytes
SHA-256: d5886790c65aac22d1ff7b7ee847bce99b3ab3fc45fc311bf99cbedf955fd035

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