Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bc9c1cf81228ad5…

MALICIOUS

PDF

92.6 KB Created: 2021-07-01 09:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 51c271462852e78e78a6f14807cd6a29 SHA-1: 9b843bc8e0a087c6d475e9fd72fba924a54391a3 SHA-256: 1bc9c1cf81228ad50d87e82a6c3961154cd9372da73f07d34e7ada79cadcf4a1
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for SEO manipulation or phishing. The presence of external URIs and link farms strongly indicates an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://fantalife.nl/userfiles/file/23751632742.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcad4ca4bf---33282915183.pdf
    • http://citra.cl/userfiles/file/tikotebu.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba43e2dfa40---panigewasegaxujon.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160dc4cecbab93---bogebetaxotusotifod.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaef3a2e00---jurijesuxabez.pdf
    • http://candemdientu.com/Images_upload/files/sipujaza.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/c0515fcf310bc86188dbfb31b131d30a/95564630023.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/a4632657fbecadb087a38a6509280ee4/darejavunofubepulafedam.pdf
    • http://filatelianumismaticaumbra.it/userfiles/file/gowixatimufarenepufab.pdf
    • http://innospectrum.eu/hirlevel/file/foguboxivewesemojododon.pdf
    • http://mojahotels.com/ckfinder/userfiles/files/pakikidaruwokosilibot.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cb424de43---15167206772.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b42e69731---49378448570.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b87d2d523---bajovurotumavibenowavafo.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/70ac3a490cb75dce6667cfaafefaaa34/lunojuwisekakuwuxoga.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/3f54acbe2eb9aaec375ad7d73342bcbd/7178104038.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/ce75290aaf832497f3683a781f3cdcb5/jikew.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a28bc8c98fd---47258390361.pdf
    • https://angelsforwarriors.org/userfiles/files/88013760133.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/6065d1a58e42e9bf95d9b07f8a4320ef/22089359885.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/vovjms00do4hd234apknlrb6g5/divavufi.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895caaba213---fexer.pdf
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/3e748b1165d9cca562d555ba8e047140/nekosefusenosat.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cd5eeb3ef---zupixodipedonugonajut.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+make+a+dragon+egg+hatch+in+minecraft
    • 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_off000105ee.bin
c65c6aaeb1f309e08e4e15edeb0ad0f7be6142a4c01c9ecbcaacea35b7e24de0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105EE 10880 bytes
font_01_sfnt_off00011ea7.bin
1e23ab11cae8060a4d017568d98c50a63a707df79a61ad393cfec60d9cea7a87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA7 17596 bytes
font_02_sfnt_off00014c7d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C7D 16792 bytes

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