Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c45b08687898304…

MALICIOUS

PDF

112.0 KB Created: 2021-08-03 18:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: de5aed951d5fd8f8b181d376267fbfc0 SHA-1: ec03ae70883af9ad777a643779ddf914ef243e72 SHA-256: 1c45b0868789830496eaa1af58181995d67efeb4dc5a244af406c06197ed8a4f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf6e26ffa8---botozon.pdf In PDF document text
    • http://sciattella.net/images/file/sulikibuninumidokat.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160edb6ddcda90---niwobap.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/8c218fc741020e90c9296cf9726c2182/nizorofopujabi.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d67ed8412cb---17558859941.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/dotavoselosokel.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/lopopudosimupitasoxepamiv.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b81301e7d---javiwezosatezelimoti.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b169b47ee---88235577101.pdfIn PDF document text
    • http://sparkpro.lv/content/file/48213319318.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/sket84al666se2j1e5qlavgg8g/jusogobixosonap.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf96c33f2c---88127679618.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/6636929118.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/28586069583.pdfIn PDF document text
    • http://congtydaihai.com/upload/files/juvazigesujiveweguxa.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/diruxadizu.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/744cb35db16e5dcfa4885223d51a9369/nifilufuboxirimimutatura.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/5hrhrtu6804v22q3farmbl1gdk/jixoxemanenudazotev.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a00aed7e568---mowejuvajokukij.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/zoropi.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/b471f3c09d00fb37fcc50c2c2171f57e/46562029273.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/72407810438.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=shattered+pixel+dungeon+plate+armorPDF 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_off00014795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14795 23328 bytes
SHA-256: 235245b55e36374bc24bef2103757fcaa9a6d1dbdfa8bcf7c813991f222f619d
font_01_sfnt_off00018161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18161 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19978 10948 bytes
SHA-256: 72582d6eb032f9819956a6604fa7e01e0b6f5067cfbbaa84422d0d6affc6ef7f

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