Malicious PDF — malware analysis report

Static analysis result for SHA-256 cab11a68fd4dd3c5…

MALICIOUS

PDF

84.0 KB Created: 2021-06-27 12:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e20c9923f8d7474250ee74e35b1f095 SHA-1: 089d43c754b164ccbc0f884dbff0f4ae24915f17 SHA-256: cab11a68fd4dd3c53ceab904fd98e32f14a079158bf43fbc5d49107bf2ae52e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These links likely serve as a distribution mechanism for phishing or malware, leveraging the document as a lure. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=millie+bobby+brown+emmys+2018
    • https://balbok.net/admin/ckfinder/userfiles/files/81968191561.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e88669b81---73467096641.pdf
    • http://mooneyes.pl/userfiles/file/26541674268.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/5c7381dbd596f9df367f7553ec0e9e3f/24268692233.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/8qjtu7rne71bd3edktllunrb04/duzomokuvivaz.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/fa426694ff5192bd8a6ef13ea0d59b98/19919481951.pdf
    • https://swift-tw.com/lcc/upload/files/9138727236.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/h6pv72e9oj4s19ilb81sn0dv01/73559332956.pdf
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/86699801908.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/7d540791e655c89346abdaab28b91f85/xanobabakone.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/3705acc9c138034876e68bddd43ac8f3/26080462412.pdf
    • http://aldo-ins.com/userfiles/file/73612261704.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/9vcjvhc991hq48u92dltn042n7/pudefupamesi.pdf
    • http://manavpublicschool.org/manav/userfiles/file/66010181115.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac21e59ebe---5433501561.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091be66b7e03---56811883815.pdf
    • http://tscyw.net/userfiles/file/20210621055314_3oc36o.pdf
    • http://aaaexpressheating.com/userfiles/file/vefizazutuwazuvizidesubox.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/5e64b7a20de2a01a5ab041c6e9b38418/lalewavuvaguzimejozed.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0b28b65b8---23642154740.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/9aced03fc3ab09a0ba12b9c0642bf1d8/15055295760.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/1328f4eea30703bca9698bf907b550e1/61314633487.pdf
    • http://buddhavehicle.com/userfiles/file/51869856075.pdf
    • http://uniquehotelsolutions.com/files/others/60865207748.pdf
    • 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_off0000e41b.bin
fd642613d54c35fa32d2ee2e2b7929d1de2ad1b8b9ff8f9fd59901282d3bb625
pdf-font-stream PDF embedded font (sfnt) at offset 0xE41B 17372 bytes
font_01_sfnt_off000111a7.bin
576e135121e5937ff5e82b7a8817877d17ab83b2b9d658842374e6b2529d7df1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111A7 10844 bytes
font_02_sfnt_off00012ac5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC5 16792 bytes