Malicious PDF — malware analysis report

Static analysis result for SHA-256 66240358ae4313d9…

MALICIOUS

PDF

125.4 KB Created: 2021-06-25 15:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a67f419e888dde74be4037d49587498b SHA-1: ee5980623245bcc16b774bc4bfb8f6f540ba1132 SHA-256: 66240358ae4313d91922fa7e925e6a0bf477ff62a61d32cf6198755395db90e6
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/q3fbsgvcrjcnp9p54mnrh9he96/28121902560.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707e4ab9442---niwuzizukuma.pdf
    • http://clarksville.net/wysiwygfiles/file/89973956520.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/9450bacba50faf0da85f2c4f6a5d1d50/torukizusovap.pdf
    • http://abc-tel.ru/data/File/63891048190.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/ba1bd021e9af645a193f7ab485154b9e/75073771732.pdf
    • http://prosquash.by/data/jironexinubudirutumeg.pdf
    • http://daedukgs.com/admin/fckeditor/data/file/20210604025430.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/17bvlcfpkce58cvebfltsvp0ri/puxufoxezomiru.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085906c3fb01---jegipabivemujava.pdf
    • http://zetrade.cz/userfiles/file/11148569401.pdf
    • http://hattingtoemrerogsnedker.dk/userfiles/file/55063248331.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607fabbc0dc19---sonane.pdf
    • https://zivotzaokny.eu/res/file/4898401717.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/de9a8882b1c80434fb65efbe0c729c71/zoxibigolozag.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/6a3a70832085db466c1218368daceb78/visuvo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=across+the+sdlc+phases
    • 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_off00018afb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18AFB 16792 bytes
font_01_sfnt_off0001a312.bin
60c038c2dc6fb855f1151b021203abb7ecc645f95be6bf6805bb79aabef41df2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A312 10396 bytes
font_02_sfnt_off0001bac1.bin
fe22e2197a024c992fe801403efd4bee40b3e41c9c094352ac1acf5bb64a9cd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BAC1 17548 bytes

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