Malicious PDF — malware analysis report

Static analysis result for SHA-256 0276a4cc22b6b266…

MALICIOUS

PDF

76.8 KB Created: 2021-09-15 09:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 18f6214fd55d595f91d80182c4dd3fcf SHA-1: 3205a262592545cb708a414e38bf4ea9054a0545 SHA-256: 0276a4cc22b6b2667b11c0b0f103f4b2dd361fe1f9359f44dd84be490726c0d7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to obscure the final destination. The presence of embedded JavaScript further supports its malicious intent, likely to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cr2tek.com/userfiles/Proj_Name/files/36627029627.pdf In PDF document text
    • http://net-marketing.hu/images/files/956080676.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/kakadereg.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/88242868291.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/5011419859.pdfIn PDF document text
    • http://gr-chem.com/upload/files/garotajurogabusezat.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d732b3634---83563784970.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/tusibedijedorusikif.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210909061326.pdfIn PDF document text
    • https://cristalensi.com/public/File/89913728468.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/sarejozakuzazulupudubun.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/924836652b79d0578c3e00e4c28a7134.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/nosutizubosivi.pdfIn PDF document text
    • http://jogagongu.pl/userfiles/file/nobovisowi.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/86225799283.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/sekisa.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/kuwoziwufa.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413a2d97dd9---sanixoxare.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d931a588d---pimudopobewu.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/34117211096.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb5794e355---dixovakigukasopame.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/0tbjolja6imseb28cshpstqq14/78802890212.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/69158251037.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613beecae7242---35614815551.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48436674019.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=yandere+boyfriend+otome+simulation+chat+story+mod+apkPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD779 19764 bytes
SHA-256: e709c753a23c062eb54886a13450dc06a6ba95a963f73737a0659184bf181f92
font_02_sfnt_off00010aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AED 11316 bytes
SHA-256: 61f116b715e3f24bbd092777f5958b2aaca84892ece3ff786a29ed4830777044

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