Malicious PDF — malware analysis report

Static analysis result for SHA-256 96b9c3888fbe4dd0…

MALICIOUS

PDF

81.9 KB Created: 2021-09-06 22:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ed6817f930ffb6f8c9cc3653d5a0137d SHA-1: 5c5d63f13845ad64e5cef285ede7a047d595a39b SHA-256: 96b9c3888fbe4dd06ae8785471496e7d05577d445b31ef5db2551258c49caf1e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to redirect the user to one of the listed malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://crysiq.ru/uplcv?utm_term=oxidation+numbers+rules+worksheet PDF link annotation
    • https://lufty.cz/UserFiles/files/buxapegonozef.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/batunojilofovufogavok.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/82579075237.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/81288600027.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/vojepulibixeri.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210613_072858.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ae1f702cf76337f2c4781eba77a7ac9a/32017728355.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e5c318c7ce5---javamesejuxej.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/81541177255.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/masotojabat.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/bugifowinosurukusepum.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/bixabudoxi.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/dosuvufisosujavilibifow.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c1871940455---2640544123.pdfIn PDF document text
    • http://samtekelektrik.com/files/85562983670.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/2444092466.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c09244e12ba---tinekerudegulugo.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/monojuli.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/9985294108.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/kofopupubupugo.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/22436010118.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/5bbf4059a25e53ed59eeab049aeb6ce2/rajedanavipitigapu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4746c6402---80609307465.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/buduzirowolivotufuv.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D1 18516 bytes
SHA-256: 3e65733b5d44710d02fb677bdc5dc3f4278f90f70afb52b0e87ed800a1fa9e69
font_01_sfnt_off00010858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10858 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001206f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206F 11060 bytes
SHA-256: 8835bd1e412c9a4119676295b706ce682239a0d7023f23e72feb18243ec17ca5

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