Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e0a3436fe70150d…

MALICIOUS

PDF

83.4 KB Created: 2021-09-20 02:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 84b5c8f8f27547103bcc982b8b24bbb8 SHA-1: e906bf0a37d4afcf653b122cb9dd2c8747acf447 SHA-256: 4e0a3436fe70150d0ffc18e899fea84ec35d37123f40ccfb9958d49096716db6
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to disposable hosting or compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to trick users into downloading a secondary payload via the embedded links or a call-to-action button.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/uplcv?utm_term=wwe+network+app+android PDF link annotation
    • https://hbfilm.ca/resimler/files/28469051435.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/53485852404.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/pasinewitogepegitenaxupo.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///48332898350.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/87619758724.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/kedolibulupafamel.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/wupofaleniponepemu.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109121151407977.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161466f4a39076---godemenenigipapejiwa.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/79204619508.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/31579823530.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/3620350535.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141af6ac7210---75675574926.pdfIn PDF document text
    • https://polytex.de/sites/default/files/83951425766.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/patilufigupekizub.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/80351274537.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b19429f52---vuxaxo.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/6134426b7eb94.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/rizemup.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/balenuto.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/20977293519.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/44663606225.pdfIn PDF document text
    • http://meditopthailand.com/file/gomilugepasavadaletolo.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/tijikibigazanivet.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/38795330840.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/gegakaxumido.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/dujedajevegakokumixisor.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/54014740066.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DE 17640 bytes
SHA-256: 8f9c9ef749fd9aa9834a4461dfe7889d6633260dc68f6a899945b373efb03f63
font_01_sfnt_off00011092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11092 10344 bytes
SHA-256: d215cbaf40e5187e40b10be41811318e929efcffaba4ee54fd6d07924cede67a
font_02_sfnt_off00012814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12814 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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