Malicious PDF — malware analysis report

Static analysis result for SHA-256 369c0ea9909c46f6…

MALICIOUS

PDF

78.4 KB Created: 2021-09-15 09:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 44660c6e10d953270787833cff15b6cb SHA-1: f99103aead02078fa296bc24aa16c354ed41f01a SHA-256: 369c0ea9909c46f6f807ea4ba74cf486f31ef3d9ec33a5f5ce12a2347bd55ddc
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. No scripts were extracted, but the presence of numerous external links indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://markone-tools.com/upload/files/kofaxu.pdf In PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/def73a5f8e2262a753ff3f9692b45b3d/12309106027.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/vjk4au77v2i0f9jci3lujcmrdp/64848411135.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/dozurura.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/46849267212.pdfIn PDF document text
    • http://marymo.ru/uploads/files/1821913534.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/88647544689.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1631177245275779712.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161416562e1325---21437911328.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/dumobewabesu.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/jobatoxu.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/jupobavovarimixuxeve.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/wutopelerinafugosevo.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/mepilomefimubuganonofeb.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/161410ee7e3c75---84432221315.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/86088712668.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/7b2658be82ca8723219436dc35e14931/zibunifagokavesedikel.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/tebebevowesuk.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/24362567060.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/5744762153.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/savufelevumawuxilamuk.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/21853896081.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/61144673223.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/177224062861314b826500b.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/wuxadobudaveze.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/jutotufulipajamizenisib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+use+incognito+in+androidPDF 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_off0000cdbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBE 17712 bytes
SHA-256: 246a10145cc48b3afa168dce9f07e49814420f9114e6ff58a7316da57cc128d4
font_01_sfnt_off0000fb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11343 10676 bytes
SHA-256: bb6d200f20c8725ab2cc3ca99ee7ee5b9b225670783b0e6510d837dba148a350

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