Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b7303040f92abc…

MALICIOUS

PDF

84.6 KB Created: 2021-07-07 01:34:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 57f969d5870475c78866e4965f5e040e SHA-1: d570f48cea68cb5660aed4d8c9cd6462e487b8d0 SHA-256: 99b7303040f92abc03342de6f6876a08245b99d66366b1f962e7d83fd15fc05c
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The presence of multiple PDF link farm heuristics and the ML detection strongly suggest a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://outspokenholland.com/userfiles/fckFile/20210514060734.pdf
    • https://turkihale.com/userfiles/file/33408333257.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160948980d32ea---dutilemarad.pdf
    • https://eksiliotomotiv.com/upload/ckfinder/files/guwujimedujenowuv.pdf
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/b7b82e0bdabc2d0e5b8a34e837230bad/89271301657.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075c5ab061b4---zibativi.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160944fadb2270---midudonugabilekemo.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d263147d7fd---94599114604.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810a842a581---wuwenokurevodaw.pdf
    • https://ivanamihic.com//files/14002255916.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072682589087---rejumixelolanitili.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/b1901593d3c3b9afe64f7973eda6f4ce/4056055990.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607457ca58995---13937191029.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16073105b9848c---15908053754.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/drq5oqr4b3j8oolpnsscfvkgcr/66245974253.pdf
    • http://balone.net/_upload/file///27986036063.pdf
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/kufutiribixiza.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c32e84caa---dikifudulewosatoze.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d006ee872e---sudesubipirarezel.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/c7nv2na76v3a1qvr121mlu9b13/78805816891.pdf
    • https://aawyx.com/sites/default/imageuser/file/wonirono.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cf17d4f8b---17467163875.pdf
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/51938945405.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=impedance+rlc+parallel
    • 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_off0000e726.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE726 16792 bytes
font_01_sfnt_off0000ff3d.bin
fb35c52e5e8831287605e4ba22ba1d9ad5c722df829c1d63afa95dd8da3b080e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3D 10148 bytes
font_02_sfnt_off000115c8.bin
d03b73c4883d5d26f9b5959cb97bd11aaa5331db8601298ffd6deb2aedd54362
pdf-font-stream PDF embedded font (sfnt) at offset 0x115C8 17932 bytes