Malicious PDF — malware analysis report

Static analysis result for SHA-256 f53e6d25dfd95694…

MALICIOUS

PDF

80.2 KB Created: 2021-09-20 23:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee6b9757fc562869e0efffc50d5e3cb3 SHA-1: e70d535ba33847d073e535068d9985516f09d47a SHA-256: f53e6d25dfd9569429b5d26b6a785e2f0862f4f8062d923307ec581cbe42cc54
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • 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 http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1612f056468cc3---bedowezukoma.pdf
    • https://snf.styleguides.ch/userfiles/files/mepojotug.pdf
    • http://irinaburmistrova.ru/files/sidigirozipubop.pdf
    • https://bunianco.com/other_files/File/30386162474.pdf
    • https://ksdc.in/userfiles/file/forelozudet.pdf
    • http://zzzwchem.com/upload/files/ruxufegisupojifudupebagi.pdf
    • http://climtech.com/files/files/xipisozowuwupegul.pdf
    • http://coomargroup.com/ckfinder/userfiles/files/xiziwejuzikujesur.pdf
    • http://bowie.abwingsmd.com/uploads/files/79637634440.pdf
    • http://gamax-moto.cz/data/dokumenty/60416474642.pdf
    • http://sinproval.it/userfiles/files/97777089473.pdf
    • http://clairvoyantinfotech.com/demo/images/15945138215.pdf
    • https://g4m3s-4p1-12s1.com/contents/files/levuw.pdf
    • https://bluetact.com/ckfinder/userfiles/files/derege.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/e116a390f43e17ffe7dacc25b99365e3/650695336.pdf
    • https://egf.tw/test2/images/file/rovuxitebilaxuk.pdf
    • https://olivermilk.vn/tctt/sites/aaa/file/nejesuluz.pdf
    • https://mimpishio2.net/contents/files/felomopo.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614161c38c92c---bajibu.pdf
    • https://lawyerupsmart.com/tempimg/file/39910705028.pdf
    • http://immodraft.de/images/architekten_agentur_images_/file/18123594114.pdf
    • http://agarimo.com/archivos/archivos/jutupononedu.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/161480e7d91fce---xopezatoguw.pdf
    • https://vaynhanh365.net/contents/files/sugakapiguzilege.pdf
    • http://paintmaster.hu/js/ckfinder/userfiles/files/fexakanibikiperasito.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=boruto+episode+152+english+sub
    • 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_off0000d2d4.bin
5bba7a5bb89d5caf975e5526646aea4fb7d7aed76950594bbfbd00d792824b4b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D4 11108 bytes
font_01_sfnt_off0000ec5a.bin
99c503ac1ae3f3766492e889cf98ca5cd0691e2a4cd2b55cb388e10ceb6c1798
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5A 17756 bytes
font_02_sfnt_off00011ad7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD7 16792 bytes