Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa27bb459ba88d0b…

MALICIOUS

PDF

147.7 KB Created: 2021-06-28 23:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 134dd2e6b8159416ca30712815b4f6b4 SHA-1: 5ccbaddd157452466e1be1b5fb0389bd04ad1c5f SHA-256: fa27bb459ba88d0b84bb8819a19e57e2469ab1c217ac0c39c06e7fbeb2181bb6
204 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 an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, potentially leading to a phishing or malware download site, and contains instructions to disable security software. The presence of multiple URLs hosted on compromised WordPress sites further supports a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce0b917660a---61752027242.pdf
    • https://ludifrance.fr/userfiles/file/76654966345.pdf
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/62u7kiv01gu761q1uu5lh4efp3/zororogenox.pdf
    • https://nada70.org/userfiles/file/87774664500.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160904dcbd40c3---69458080640.pdf
    • https://cgeminfos.ma/upload/file/dunigaximolobijigokufi.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/5fede82542c2655846ccf081c38fa253/kijefisopuposebijuwu.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a26c0594659---84418544157.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607814acba3b3---pixegi.pdf
    • http://2440027.ru/upload/file/mebewetaxuzimuwot.pdf
    • http://benthanhsgfarm.net/images/uploads/files/lorifinabaxikalitimita.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/6010cc6968d074b8a57552168804655f/limizimimuvo.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/fabetepepuwovutasidebuwi.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/2b0dc8c172c7676716e779874da44639/fezarevalukuwomogem.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098eb0c11d8c---suzewemumomovitirab.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/6b4d23aa4371c5aaaeab95bcd0ffc8c2/8065705315.pdf
    • http://titadoorbinhduong.com/upload/files/jusepipexet.pdf
    • https://vsetinrally.cz/userfiles/file/mipabewirutonofukuviri.pdf
    • https://prtl.pl/userfiles/file/59553490693.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bba7854019c---pidetabowamavof.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2eb83d4693---47910258744.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/dmj7pp49c48lqjlvo3rkqfisd3/visufoxutib.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6761ded3d---72991176568.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983495acb4e---defijisemawafoju.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=return+of+the+king+pc+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0001c22c.bin
61b38a0f1425e170c41c6c2237164d227be380a73805ba83c5b76a5382ff733a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1C22C 17492 bytes
font_01_sfnt_off0001dc2e.bin
e21c52dffae5908a29503fd994d4d112c17e2ec6cbaef7d5391565e4ba308c9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1DC2E 19140 bytes
font_02_sfnt_off00020f24.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x20F24 16792 bytes
font_03_sfnt_off0002273b.bin
16caf44bbf10cb10f47016956c745234936ab5bb40a7fe7f5fce3e51e798fc54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2273B 11056 bytes

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