Malicious PDF — malware analysis report

Static analysis result for SHA-256 b002f90d087ab644…

MALICIOUS

PDF

104.3 KB Created: 2021-06-10 00:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f3ac7c978a0d7b50a11d255e5f36659 SHA-1: 448fe311a66585edbaaa9cb6c62f803b76f56566 SHA-256: b002f90d087ab6448a820de48959c5032b4011373c7c54771c22da4f62a2f78e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs and is flagged by heuristics as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains keywords related to 'memory cleaner' and 'booster', aligning with a common lure for malicious downloads or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://drafthe.ru/uplcv?utm_term=memory+cleaner+speed+booster+and+junk+removal+apk
    • https://landi-bg.com/images/file/goxeroxaginetamusilile.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/h6p7tv57kfcfrajb97ha5ktlqr/nadiwexo.pdf
    • http://przychodnia-felinskiego.pl/uploads/editor/file/5351138294.pdf
    • https://himalayanwanderer.com/himalayan/userfiles/files/molevadinalaxiz.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e94bb8c425---23665506275.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608242efafff4---juzesemefu.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/5bvkko99gplk54j8n5r0o7hj1b/89179321114.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/8f19682466957c0771b236dd4f697fb0/gimisorebaremuj.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd8040f180---31126189566.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/s8a9cgi8ce90q6as0oh345sokb/soxubadegozenakife.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/licingr6vhmltbm97cilm5ui15/15517498172.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c474bb992---topajubowoxetipebe.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/c2ee70268887efb2dfd3b8baa2c0c9e9/tutedowivemapul.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/d2d2f7d6200978b9d38c5796c220c782/66458530983.pdf
    • https://twr1115.net/files/fckeditor/file/vakefaziliw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000158f3.bin
3817cf3e78680b0236e302847adeaa693a28fdaf6dd5856eee6ea1f8bacfc2ae
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x158F3 32064 bytes
font_00_sfnt_off000118b2.bin
525982f1d28f4a28b16951271f2b66eb7279fc50f11575f8e7a998d3be15c8e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x118B2 2912 bytes
font_01_sfnt_off0001230d.bin
fad203132b0e43b2fcf6c962a819b2e9f24b47a15e562dc5527feb0ce951f488
pdf-font-stream PDF embedded font (sfnt) at offset 0x1230D 5664 bytes
font_02_sfnt_off00013656.bin
85ea425b0986a49cae4594f215e6aa21f4a7af6802e77c2532837c89f79fa301
pdf-font-stream PDF embedded font (sfnt) at offset 0x13656 10016 bytes