Malicious PDF — malware analysis report

Static analysis result for SHA-256 143dbf38883fa4c7…

MALICIOUS

PDF

85.2 KB Created: 2021-07-03 03:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f7cdf43f42fb8b1d43a9d2e0fe7d8b57 SHA-1: 43a51b392559fbc79491f21d600f49215e423a69 SHA-256: 143dbf38883fa4c7f386cfe94b38ae9ba583e758332b5ada47d1fad07683974a
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 an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URIs and link farms strongly suggests an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/bd72b4f4ba132702b187a0882cdc1eee/42289266498.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/2454f3da08fa874f0cc317cb0ad35794/97682469532.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/17986894734.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/8116b21d8d1e5c0ce32dfc577a7905cc/logob.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0256708ae7---27000952715.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/6c7e674bfba49e216adfbbebe1dad9e9/zepifilogiweradunotukebop.pdf
    • https://digiconelectronics.com/media/miviliveguxepedonomi.pdf
    • http://karmand24.ir/basefile/ehotel724ir/files/lisoxufakudinetum.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/de6ab1d1421bef5901c6825d2673571c/verabum.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0b4cd5e4b---rujepopumusegefikizebame.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afcf3f824ad---23802966937.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdae4b99b62---kalimaf.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2319089c6---nivezefewuwijiwaf.pdf
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/63517918653.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b92ccfd39bb---76310262073.pdf
    • http://kaitosushisb.com/uploads/files/24295273828.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/0mtpnmmb29n35sc6oeojk80a63/fitasozigij.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e13329ac0---xematigoredosegobuka.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/af7pan5griu2hdkv3eqoprqq6e/nunigititexageleru.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/b50e98cfefadd03edfd7682e76fe2efc/36809839341.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/aa25e3e9a7f373047e48199eca26e013/35446724023.pdf
    • http://helpibr.org/clients/f/fe/feaff840d005acecac0f151e8679c8db/File/31417110876.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a73a4f80e---tigamodenosagituvar.pdf
    • http://automozg.by/upload/editor/files/ralurus.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=android+rich+text+messaging
    • 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_off0000e9ab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AB 16792 bytes
font_01_sfnt_off000101bd.bin
775f3dcb0ca61f5b51740fc2760495b7c012301c3505d422493be3faf5df3251		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101BD 17120 bytes
font_02_sfnt_off00012ed7.bin
1f0921c3d7f2e32ef22c8ef3459f8622a13c8c099e98fd35b36bf342df463725		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED7 10852 bytes

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