Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b9cd14d18963707…

MALICIOUS

PDF

78.7 KB Created: 2021-09-17 07:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2d9419fc148f20282b436d7f54b7a68b SHA-1: 712c9e38a5c9994783a25092c3eb2dc00beaf5f7 SHA-256: 8b9cd14d18963707b75f72e97d9a1052f16334b9f77672dfde413ca7fcd29336
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination or leverage trusted domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138367e941c1---10796049005.pdf In PDF document text
    • http://plise.org/userfiles/file/81133995209.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/59880034787.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac88e0f476---femitetifijodotadij.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/somoxorudilobupamifezetiw.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143df31494f2---bivuvawibo.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/nikawiwavuvo.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/43arfb46uijjru9lj77rglvfq0/81072566768.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/53217189764.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/naligoremekubolowilivefu.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/75921873551.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/63283471541.pdfIn PDF document text
    • https://mbbs.hr/files/25696538718.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/koranekimowezok.pdfIn PDF document text
    • http://feminella.ro/upload/fck/lazenemukemomosiwubefitan.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/tazinutedegawutato.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/xeguni.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/vejelu.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/ll6c4f6a1gk5p6q0qi91dsqns6/52904614272.pdfIn PDF document text
    • https://adamslakeband.org/userfiles/file/vutozovijonekiso.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613003a2d50e2---nifuxij.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/41994273261.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/piluvupo.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/a5732258224cb984fdb85666a564327c/kupobozizizadebaralefan.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/womoref.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=mod+menu+for+8+ball+poolPDF 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_off0000ce70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE70 17620 bytes
SHA-256: 81469fc5c01a7da8282f0796b0ad5bc0581e3e2534f5ad8a31351049e13323cc
font_01_sfnt_off0000fc2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2A 10744 bytes
SHA-256: f898bc34022df0535ffb18781cfffa20eb76010fd881524e846537cb0a36ed1c
font_02_sfnt_off0001149b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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