Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aa720f3766aed43…

MALICIOUS

PDF

91.7 KB Created: 2021-07-02 21:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ebcda8bc26e57b8c0fdaa615b2d98fde SHA-1: 8ad017faddafdcfd98eff60c2c60bb53a85f62be SHA-256: 8aa720f3766aed430f40121b72bf6ac870dc0c9167b1dca076290cc8d5ae1d24
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories. These links likely serve as a distribution mechanism for further malicious payloads, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/qvnfg7af3h3pqbnf5n4bvvth25/posiwinazote.pdf
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/b3insa1t54hhp0jdvhrlf7hvhi/38232970083.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080a78678d34---5638483798.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/9drp5nmke0e0ml546ge158k6cs/vonavikud.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/02a7d20f6e0264fbdf3b40864057948d/3035475641.pdf
    • https://cambodiaangkorhomestay.com/userfiles/file/leginaji.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/9940fcd4fb91995aab954a46110f16ac/1634714781.pdf
    • http://z-i-f.ru/userfiles/file/wubitovorozovajog.pdf
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/pojolozoxevuwolefulidog.pdf
    • http://colafranceschi.it/userfiles/files/gajefujijep.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/b31dc533ab8c27de618a7013021ec4ea/finewukemebejomagavika.pdf
    • https://jamurgoreng.net/contents//files/53539697637.pdf
    • http://nesemlak.com/test/images/uploads/files/63002553232.pdf
    • http://geologocarmignani.com/userfiles/files/zetiwogifutu.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/fb53995041d3bddc3b96216af60d8c0c/mulosebo.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae6f707e7f---19109944379.pdf
    • https://bestofbucerias.com/upload/file/kalarudedurevew.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081affce0be8---luzarovewimufu.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/nlcn68oiui6r7ck0oumllpr65k/zowapemoxiru.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/476fc1994021c510a26383232f226398/17474089464.pdf
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/boned.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f57338f17a---kexivexiranejinifagirik.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16071c7b111113---62351206914.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ce79203ee47a3d36a06f9b9439c97a89/37969920077.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=probability+density+function+for+exponential+distribution
    • 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_off0000fa8d.bin
24f27a1bd4a1a0e15c41eade55eb3f1012a1cc341901381e6daa116de45ca761
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8D 19176 bytes
font_01_sfnt_off00012d4e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4E 16792 bytes
font_02_sfnt_off00014565.bin
3bd5e9feebcdcbbc3666efd35d11a7e95ba290c38b9d238b2fe871c5c87c1cc7
pdf-font-stream PDF embedded font (sfnt) at offset 0x14565 11072 bytes