Malicious PDF — malware analysis report

Static analysis result for SHA-256 584381a4aa7909c7…

MALICIOUS

PDF

81.0 KB Created: 2021-07-04 16:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e37c2ef1c6595d6b09b63d1fc5d1fe0e SHA-1: a4ff3cc26069f5d9caae44c514152eaa9ab5fe32 SHA-256: 584381a4aa7909c7f3b88ed58e4bf148260b5aa42cc07f60d70c45d0ace52b40
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs, such as http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a286b9d39b---fomixuxofidivuvito.pdf, are key indicators of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/d1e8bf093226e80df56d5ac17ea789ad/34898499944.pdf
    • http://studiolegalezullo.eu/userfiles/files/finokixarejuvufawofe.pdf
    • http://dailymaytrogiang.com/userfiles/files/40777531617.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a286b9d39b---fomixuxofidivuvito.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/6e4014be161b048609b85219ed2970ca/73861799983.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b33b789a4d8---1331997420.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d9565ba56---takotavuresobivotuv.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b720ffe7f2c---jejugodozesexigoludega.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad29b974cb3---66864390668.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bur1j9deagd9tnfrvqn12tvqh0/83832753439.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/c1c6ff2ab38fe937e6c58214f0a22c16/mizagigivibusenunuxam.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9e2420ef3---52007860122.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/jcfm97jbb3gc539sacjqp45ivv/navuwomofaradejudu.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c722952f8e3---dojojexosibal.pdf
    • http://arebiatours.com/uploads/files/85903702916.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/8846626e7f4981d55a98df47e2c2f82b/99783003378.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/918990507cce9c5d74d7eb1cf4818a50/gululemoxewujinaxiberela.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98f333c07d---kedamaxudibafumufuwenila.pdf
    • https://lifecareproduct.in/ckfinder/userfiles/files/kafemiluzerujisutubogop.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843b07b23a6---gunotepepitutili.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/8c7f57174437ad6834b322147b204807/sirunatesikadakagaw.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fec5e5f6e---27205436075.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/j6oe2ncf37ul99c4ob1qu97prd/8886194828.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=pokemon+ruby+omega+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_off0000d8e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E0 16792 bytes
font_01_sfnt_off0000f0f7.bin
526046cbe75d06dec4fceca3d1d55a868263f192f8a0ecff2f7097fe8be7f981		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F7 10764 bytes
font_02_sfnt_off0001098d.bin
a02497b16711449a47c0b5a4e8423c91e13f251addf0f67931dbea289847d655		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1098D 17472 bytes

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