Malicious PDF — malware analysis report

Static analysis result for SHA-256 b475c0c92d985b5c…

MALICIOUS

PDF

85.3 KB Created: 2021-07-04 21:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44d4af9e4ebd6c4dcbeeb1816a73470b SHA-1: 302bed22be50988fbcf2b3f64c208c45217dcfd4 SHA-256: b475c0c92d985b5c90dff84d1f267cf32ea9c7c60aae2f09b06ea370852e241f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/54230a34183de468f08fc12bd821c5f1/67642228253.pdf
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/zenonofi.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca54e18f75---bawomiwirinagotojajuki.pdf
    • http://evergladesharvesting.com/ckfinder/userfiles/files/64720414690.pdf
    • http://temple.mo/userfiles/file/papiwomokibeba.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/262e6de73e839b53c25991b46b851232/mipoxinumonulevubew.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/vedazi.pdf
    • http://abpaluso.com/upload/file/biforomavuworowugitotekoj.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/24c689ec6722b6ae8ccf47e8d9652612/dawolinu.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7dc4541e7---29639132243.pdf
    • http://ascensionchina.com/userfiles/file/15985101104.pdf
    • https://addsfly.com/userfiles/file/716555843.pdf
    • https://apskarota.org/userfiles/file/98246309497.pdf
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/vegamafufufugotakaniw.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a847d45e42---duxanuduvuxesasevumam.pdf
    • http://quincy.pl/ckfinder/userfiles/files/25742572054.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160987f43373fc---jinudefaluminaxisiv.pdf
    • http://dui-antidote.net/images/userfiles/file/bobesi.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/be4caf3134a1b346fb81d07d2710d56a/54563849058.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c8de33443---gebudumukada.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a997251f3aa---nogakudelazosexe.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ea34eb99d---walubifobogumemigefa.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a202dcec6f0---gemigupamem.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/t2ftmbb1ppvumofnhv23p9hlm0/5340672200.pdf
    • http://clubmaniacr.com/campannas/file/neteropawawepuzureb.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3e2ebc7cb---daxef.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=0.5+kw+to+hp
    • 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_off0000eb53.bin
242599ed21025cc7f4f804ff53bba453078761dd73e17f00664690c7d4fce354
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB53 17760 bytes
font_01_sfnt_off000119e2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x119E2 16792 bytes
font_02_sfnt_off000131f8.bin
a40f0cb0cfda56ac66c92cece33066bc4d55fef1c2a73fd65a0e8d63afcca701
pdf-font-stream PDF embedded font (sfnt) at offset 0x131F8 9948 bytes