Malicious PDF — malware analysis report

Static analysis result for SHA-256 439be1abf5a69e0b…

MALICIOUS

PDF

101.7 KB Created: 2021-07-03 05:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b3858f04f1c2268979f700c7b9849d97 SHA-1: 3d991ee03136ae26076135cc5851e29e991cb46c SHA-256: 439be1abf5a69e0b433c65c5b7ee8e192084e29be6b85b7f03816aff089cfd8e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous URLs pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further support the use of compromised infrastructure for hosting malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9787

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 http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/2jqb5h3k8vno6o29e5776l7371/ripatirokilofuvevovuwolew.pdf In PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791cde91760---romoloxomozisitavoga.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16091706d30deb---39405374445.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/mawaruxazowatexilafin.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/s4drumeouv68ssbdg6f4tqlnlv/nakenafiriwe.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/kl62jtcer3ovajclvg1sjph153/33896792833.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/rfdghrd8kmhu7n1tkl105nufk6/50416520997.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/80859643538.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c1bbf35e7---26311977808.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/flv3hvlnejk99rqqc9idd3l147/jiluwovedepezuwutomepid.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e48ef554bb---20196424375.pdfIn PDF document text
    • http://coffee33.ru/archive/file/vinusu.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210618040925972529614.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/pi1k2bfqberh71j3chssqvk0vj/13439714552.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/26ec13d341a6ab689159fa21f18b08fc/maloxozidejirun.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091f4bd836eb---nexusutibomadolapuzover.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/lulut.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/27e97ae2b49b876c7cddb68b1e9e5e14/54704173989.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/6840c53b23fe82df7822c4be98acf10d/depetufaxipopuz.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d9df13a94---mifezebuvabimixurefusa.pdfIn PDF document text
    • https://paperland.bg/uploads/file/ligubejarenajafukaku.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/28822777077.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/13e9db4c784461101c547a4376c7d0db/vetodolozogofuzatudura.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/nejabuvajuwakidelu.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080e93e100b9---26885409883.pdfIn PDF document text
    • https://mahae.hu/files/files/97986118869.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/9a3f533c5ce264599502543875ed1ffc/kuxubufeluwadijesetu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=story+writing+king+midas+and+his+golden+touchPDF link annotation
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000122fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FD 20072 bytes
SHA-256: d463253d55591edcd9dfa286488290045863388f1eef5b727dc3a074bb458149
font_01_sfnt_off000156d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EED 11284 bytes
SHA-256: cd94bd455fa9ff607ffe611f249d378cf2e570d6305a8027c05a3ddcc38a4146

Open this report in the interactive analyzer, or submit your own file for analysis.