Malicious PDF — malware analysis report

Static analysis result for SHA-256 028cdc410cce7ccc…

MALICIOUS

PDF

83.1 KB Created: 2021-09-01 14:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a3641c0cb6e3947375c9d36ebfdc0abf SHA-1: e9e8165560152736a31ff61efb5bf6b16351027b SHA-256: 028cdc410cce7cccf51539be85c54cdccd97535501d3ac4470970975314b94c6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it's designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript points to T1059.007, and the overall nature of the document as a potential lure aligns with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://wujipacking.tw/upload/files/mobadelexog.pdf In PDF document text
    • https://novzelandiya.ru/ckfinder/userfiles/files/2043454076.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/kisit.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/481ih29a0rr36h4s1hhtr8phh4/kiwotopiniserixo.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/pikanidireloreregolusepos.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/dotolexokamawiz.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da741ab4cb---90606129869.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a20603e7e25---22352121416.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/fajavebowomutarosad.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///wixegokoz.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/30947686786.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/64665337204.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ejuzupemo.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/a8e21d80d7acaaf3f69ee24369a59abe/wikonedogagawutedux.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/c7tl41decdgrst0i0f1i7plavk/rurowamit.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/83708755874.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/ed9feb9d2001d384bf884ef53742958f/tefofidulufakokenero.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/66024843511.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b63a1d30ddf---burenumo.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/tui2l5e4vjf8aajsq99ltldvle/7274810727.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/97259572800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=off+to+a+flyer+meaningPDF link annotation
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/73518035823.pdfIn PDF document text
    • 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_off0000e120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE120 10528 bytes
SHA-256: e140a977df6960e3ca92540c0053fec7db2ccc144e8a75002f9bffc3d1fce89d
font_01_sfnt_off0000f91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91B 17524 bytes
SHA-256: ebde616a0ba943cb925acaa65621712fb617f52d7704b6b4f4d146e686cb42de
font_02_sfnt_off000125b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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