Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7df8e7f97d7caff…

MALICIOUS

PDF

122.9 KB Created: 2021-07-21 01:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4e8a820b67c7602f9bcbc7194b829243 SHA-1: e2f9bf71b8eade6365705603c25418f148af3a2e SHA-256: a7df8e7f97d7caff16c67bd0c908988dc0c5491485060de1f2988743a2505c87
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0acc34331d669177fe723d0db6c64451/31215793122.pdf In PDF document text
    • http://wisdomtours.net/upload/file/26801497013.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/wojimupizijaxonijekupu.pdfIn PDF document text
    • https://intellicapital.in/ckfinder/userfiles/files/kikivekesedexobofiv.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/508c8098035944533fcd12d41d7854e7/158017870.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160f07e89521be---51936336335.pdfIn PDF document text
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/47644415106.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210516212718.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/be3af3d8883a935b63f081ab868f7c79/podajewugazukejewevu.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ece650f02---lagudiridomadutefuxum.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873bf6983b9---27681078983.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/fd1bbca0dcdefe4100e1e8fec475a54f/lujexunixok.pdfIn PDF document text
    • http://beijingbeat.com/contents//files/72752435517.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/d12fafb4d336dcc1729252993e848270/89101962615.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/4a02774142512eff7f6ac6ed9dac9a91/mozexipojilexobabifodukop.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/jipulunudiloxaju.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/mixabugivijababiv.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/30569950760cfc4736bfe8.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160caa918c7ce1---jewuwogodujuripofunuko.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/35403604054.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/gupolobozetajuvowixa.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/fujizafujilere.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/5e23b721bb5b0133a7ab4093e65ac360/lisaxafokawuxeku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=radian+to+mmPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17241 16232 bytes
SHA-256: af293b2b60dc5e826b00d8953dd18f37a59bdd939ad7d7593537948814e7f124
font_02_sfnt_off00018803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18803 10008 bytes
SHA-256: 909b5e2ec7405a1e6850ea680b28c2c5ab0f9c23eddcf943f46e6de01dfb8185
font_03_sfnt_off00019e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E23 20636 bytes
SHA-256: a2b24e5b174e3f84399a41a6947d502583ac8a79f4fd8004b18154e619ff8432
font_04_sfnt_off0001d48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D48D 2012 bytes
SHA-256: d8828755586f592dfc288c3cd2591327f73be21f24f9857a81777d1abc4ee62d

Open this report in the interactive analyzer, or submit your own file for analysis.