Malicious PDF — malware analysis report

Static analysis result for SHA-256 036de49045e501fe…

MALICIOUS

PDF

73.7 KB Created: 2021-09-14 11:34:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4825d8bbb58f7466ad69148f2cd45d99 SHA-1: fdf588e39d6a5681afa27997c6151d281ad2dc81 SHA-256: 036de49045e501fe946ce97112092370b6e1ebf07a2728b13e4f437ec78de3e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms. The presence of 'utm_term=mobile installer android' in one URL suggests a lure for users seeking mobile applications, potentially leading to phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9c17de87e---baxulifadaromuvot.pdf
    • http://wohntraumgmbh.at/vugelijatetixade.pdf
    • http://nicolalazzarotto.com/userfiles/files/nusexuv.pdf
    • http://nitexprofi.cz/userfiles/file/84161251566.pdf
    • http://meubelenindex.nl/images/uploads/92119658394.pdf
    • http://suncitygroup.ir/basefile/suncitygroupir/files/gexakaxupuweponokofefap.pdf
    • http://londonjip.com/userData/board/file/38587239942.pdf
    • http://trips-in.com/ckupload/files/jenuwovivebu.pdf
    • http://amsaneeraus.fi/userfiles/files/940065218.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/81092394c2d064048e53f5956dc6188f/88957566397.pdf
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/10100072110.pdf
    • https://tidaksusah.com/contents/files/jadomizuzez.pdf
    • http://arucax.am/user_images/file/9158603291.pdf
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/67167159578.pdf
    • https://poganyvolgyi.hu/userfiles/file/70964090398.pdf
    • http://franzoesischebulldoggen.eu/userfiles/file/67099883695.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb0f78ad70---3909277573.pdf
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/laximujav.pdf
    • http://www.jindatunnel.com/up_files/file/fivuzurototizas.pdf
    • https://imagebuzz.net/ckfinder/userfiles/files/poxofimiw.pdf
    • http://webinaris.eu/ckfinder/userfiles/publics/files/21162865987.pdf
    • http://pomelieagency.com/userfiles/files/90106398270.pdf
    • https://ozora.schaffsen.com/contents/file/12432420297.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=mobile+installer+android
    • 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_off0000bf02.bin
6708c99bc7ca7f39901db088115aa404ca9a7677bc0b1688cfc29e15c0ce44a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF02 10376 bytes
font_01_sfnt_off0000d692.bin
093dd525f7169b39c30691db43c89787e57b93b2ec69ddd2287c3d0d098ba918		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD692 16700 bytes
font_02_sfnt_off00010177.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10177 16792 bytes

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