Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd7434edf0493733…

MALICIOUS

PDF

76.1 KB Created: 2021-09-11 18:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1a9f9417d9a1608f7ab6abdaa867aaa9 SHA-1: 0f4ead8efd93166aa9884e6faeefaf55bd220a6c SHA-256: dd7434edf0493733f7d71bbf19f4c8881f1ed5b59e8ce6451ed49ddda6082066
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple domains, including one hosted on compromised WordPress upload storage, suggesting an attempt to obscure the final destination and evade detection. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huyndaicaudien.com/upload/files/54241412927.pdf
    • http://fteq.ru/files/file/11848760163.pdf
    • https://krusomying.com/data/file/97414311678.pdf
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/5694081486.pdf
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/kujimiluwezukemuzokof.pdf
    • http://ankamet.com/userfiles/file/37133812576.pdf
    • http://esenkardeslerinsaat.com/resimlerfiles/fegabakama.pdf
    • http://canavesiobruno-architetti.it/userfiles/files/89244435006.pdf
    • https://greenboo.vn/uploads/files/wiwoj.pdf
    • https://learningsolution.ca/userfiles/files/69508072653.pdf
    • http://spiregene.com/image/files/20210910_023045.pdf
    • http://www.heksan.com.pl/file/doxewumokave.pdf
    • https://harkakotony.hu/UserFiles/file/63740193550.pdf
    • http://tischtennis-kiel.de/images/file/luwox.pdf
    • http://kammatrans.com/userfiles/files/puzikabizobotasirale.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/bukifafuzugebel.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f60287fc25---tokoletakomowiwiverimu.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e49407531---bixubujolijanabam.pdf
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/pipor.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9bc948a8c---7977337348.pdf
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/jefimisuvinirolula.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=pick+me+driver+app+apk+download
    • 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_off0000c6cc.bin
0d0948e529c976b5ecb46e374cdd710a299c609a5ca2ce436a2a169b92ebff81		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CC 10652 bytes
font_01_sfnt_off0000df20.bin
c1ebc2eb248485087b2c103cadc13ab125c79d6f44e0c6bf2cc95948433b5c27		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF20 16888 bytes
font_02_sfnt_off00010afb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFB 16792 bytes

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