Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c81808a7bef04f6…

MALICIOUS

PDF

71.4 KB Created: 2021-09-26 17:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7e9d415264330bbfaabea8062a9379f2 SHA-1: 16c11953031e05b8733f7940794cc6e72fac99c4 SHA-256: 1c81808a7bef04f6519d8bb6f7f26d5d62059a311817f2cb13d3cd4d55b9be46
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are used to distribute further payloads or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://matratva.in/userfiles/file/jajisejenasonojejax.pdf In PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381d8db5b22---fixuxemimuze.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210920_24AEA7972FCB56F4.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/93ca98f750ae5e763c52425234cceb7d/tatekebanom.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/63660831432.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109261813015162.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/54030764206.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210923_79E08DD69E866E6D.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/xoxuse.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0ed00c410---85090588886.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/zakimovepefajomebo.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/80164e981b2d1ca6a9c52cb7d96cfc7b/97770441061.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/62468674972.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/75a9eabd69a495f4c18c0953ed8301a5/53783700128.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/58178908469.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/77948052336.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/10564289544.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/rumanalilikixukubenesuf.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/36312166430.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/mozad.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/rifulobarupuki.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210922042540025.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=android+tv+use+phone+as+remotePDF 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_off0000b373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB373 17160 bytes
SHA-256: e151ea893ba4462ba2a52fbc23016aa9ba128543b118593649042c1693036285
font_01_sfnt_off0000dfd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD5 10756 bytes
SHA-256: 410dd67d207a480110c41eb7e030520b69b0c615f1bfd9595aa149fa521511e9
font_02_sfnt_off0000f86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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