Malicious PDF — malware analysis report

Static analysis result for SHA-256 d25c77c58872b3e7…

MALICIOUS

PDF

76.4 KB Created: 2021-09-17 20:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d45685d2d7603485ea3378dd65bd3f5d SHA-1: 0f6f550e925870bdb138c4026a938cb3fd6227f4 SHA-256: d25c77c58872b3e785f87662527770788f5d80591f08e52a9700f27baa735224
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or download of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://garglob.ru/uplcv?utm_term=billions+season+5+putlocker
    • http://greenhere.cn/upload/ckimg/files/202109100823076718.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161408f05c4f23---kusojajeripojizugo.pdf
    • http://liveisagenix.com/ckfinder/userfiles/files/32727240161.pdf
    • http://4bx.pl/public/file/90610970088.pdf
    • http://www.recko.ru/ckfinder/userfiles/files/mifirutojinagevefoka.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16135f626cb2c7---11314330686.pdf
    • http://hocomesun.com/upload/98993151315.pdf
    • http://artpolinakuzina.ru/pict/file/jonitifanotafixosunoduwig.pdf
    • http://agierresrl.it/userfiles/files/maxajofezofixe.pdf
    • http://maxbrio.kr/files/files/reveserisubenabiluja.pdf
    • http://gzbaosui.com/uploadfile/files/46267668816.pdf
    • https://cupanghitam.com/contents/files/10404460573.pdf
    • http://a899.net/userfiles/file/visewamediwesebavumiwer.pdf
    • http://hoteldanang.com/uploads/images/files/72180470206.pdf
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/varefidofadufili.pdf
    • http://zzzwchem.com/upload/files/zugodoxigezozomixijagav.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/4b116c2e099cd36c048014be6dba94d3/33215523999.pdf
    • http://studioscoponi.eu/userfiles/files/32870804029.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/964e79c4dc3c09392a4377758af5c78e/pikufazifelezes.pdf
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/vunomevabujosusef.pdf
    • http://orderleesushi.com/uploads/files/tusogotoneteboko.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140be2a5f0bd---duwivo.pdf
    • http://bayanairag.com/uploads/userfiles/files/12710930423.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16143d9b8c9e96---jifixixudaditiwasami.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142eaba230d2---borudelimapozobidapejema.pdf
    • http://semihkerpiccilervesupersound.com/upload/file/70721424826.pdf
    • 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_off0000c310.bin
a8a62a4a4f653942102b0e9973736650ac9cf3ae6182ef3a4c6e35f6817720bd
pdf-font-stream PDF embedded font (sfnt) at offset 0xC310 18116 bytes
font_01_sfnt_off0000f1e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E8 16792 bytes
font_02_sfnt_off000109ff.bin
65831bf5a1f799332e1e58de20bb235f83d90c9bbb5861b3f4f23a87500e6a8b
pdf-font-stream PDF embedded font (sfnt) at offset 0x109FF 10744 bytes