Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0b941ecf91e600e…

MALICIOUS

PDF

91.5 KB Created: 2021-09-18 00:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 784e7542ca16bf37abef8fc2aec04365 SHA-1: aecd9bc69234392679bb47af9f7c3c57c78a056e SHA-256: e0b941ecf91e600e2d9678b8f4aa6c4eb4d5060f05a9db0e2921a0427df62e64
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also functions as a link farm, pointing to multiple URLs hosted on potentially compromised WordPress sites, suggesting an attempt to distribute malicious content or phish for information. The presence of embedded JavaScript indicates an intent to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f89df00736---kubunalu.pdf In PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/96167220786.pdfIn PDF document text
    • http://sinners-party.de/media/file/82165543657.pdfIn PDF document text
    • http://piannocreativo.com/js/new/fckeditor/userfiles/file/34620519362.pdfIn PDF document text
    • http://sissonne.hu/editor_up/nimosotaxituxot.pdfIn PDF document text
    • http://maha.tcnme.com/chop/multimedia/userfiles/file/fewekux.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/90897519144.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/6d48f2856b2bb40b13f09ea8ec8adf4f/51624600520.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/59696808820.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/70069524642.pdfIn PDF document text
    • http://netart.hu/userfiles/file/nevaneworonuvimuzawefur.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/99582603010.pdfIn PDF document text
    • http://khonggianxua.samdigroup.vn/app/webroot/upload/files/32256497846.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/pigojanegep.pdfIn PDF document text
    • http://kahasat.cz/data/file/16580310386.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210908172135.pdfIn PDF document text
    • http://plise.org/userfiles/file/juborapijimef.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/35672665828.pdfIn PDF document text
    • http://onelove.cz/file/68920194668.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/88699321016.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/3c9d9ea85aad12b927f84d2e7ae31aca/64356823038.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/92807822971.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/93591862074.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/80588489108.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210908_085F5D29331FE542.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=first+name+last+name+englishPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD151 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_01_sfnt_off0000d94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94E 10412 bytes
SHA-256: c207ce2afa7e6587aad35e87d63f8c20b11a66f9e447f2f980a5115595406a55
font_02_sfnt_off0000f0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A6 25520 bytes
SHA-256: 3c431e2db6355ba22c189c6abdf76b16587abd26642346d1a037ce4995c6fa3e
font_03_sfnt_off0001315d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1315D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001496e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1496E 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d

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