Malicious PDF — malware analysis report

Static analysis result for SHA-256 dde00428719323dd…

MALICIOUS

PDF

82.0 KB Created: 2021-08-06 14:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6f1f3dd5232fa24429999832de7a6d57 SHA-1: 28df0d151fb45faaedce81bbc7047a34e79ac9e9 SHA-256: dde00428719323dd957ca9d16ea46b33f03414a7f48fd14c0602f9a51e0c87c1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities and delivering malicious payloads. Several heuristics indicate the PDF is part of a link farm hosted on compromised WordPress sites, suggesting it's used to distribute malware. The embedded JavaScript likely downloads and executes a second-stage payload from one of the listed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608351a0ba9b2---88310605941.pdf In PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b782a61f9---pesosivet.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe12bbc016---63262245304.pdfIn PDF document text
    • http://yjccnc.com/upload/files/juxub.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d9ffd1e71---kusuvaserumubep.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/63945038279.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f08475684ad---35527424557.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/d43945e74066b5b84bb62d1034f238f7/93156218126.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/sifomus.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/xejumelitedewukonasi.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1620839495.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/faa6be54fee6e63dc601c2353d420ac0/40654921092.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160f8ade5e76cb---wodugolibifuzibemu.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210620_2B8E262664A97098.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5f30c7e1e---24950020876.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608550db9e279---sakuramutenibiron.pdfIn PDF document text
    • https://allianztc.ro/files/file/samurive.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/37482114444.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac89dcb088a---99668873440.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/8acc4156586795f548965bef296f42b7/tajonomami.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089516f66415---gamil.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/puwokivufafopim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=countable+and+uncountable+nouns+exercises+for+class+4PDF 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_off0000db54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36B 10920 bytes
SHA-256: e2201f38ed9dd343dcfe611fbb7c69bc1b71ff65d3a4b04baaf11d1176a3f8ea
font_02_sfnt_off00010cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF1 17304 bytes
SHA-256: 74a2ff9f1c0e23b17c85f3449ac2af89fe3d0773b454f1b8e935b081ff04738d

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