Malicious PDF — malware analysis report

Static analysis result for SHA-256 842bb593a3b7d765…

MALICIOUS

PDF

77.5 KB Created: 2021-09-01 08:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dcba11d7a053e6d74da5c6ee01e31c49 SHA-1: 0857fc3fb191e43b2a758a5002c9b623043aa4d0 SHA-256: 842bb593a3b7d765e0fdf894eebbe5da9b66e383be5548519bb8e53ae5ccd3a2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress upload directories and other disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://hunde-katzen.at/soubory/wujudodunovaxas.pdf In PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/70f92972d2310cb60ffcd328986b3450/wunurezapej.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/fibufebikalol.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/o2eksjnhumrrhj59f7frmslj60/zebajuw.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/gomuveduk.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/33017378246.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/11024059158.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/04c833b3bc32927cea57795f033ec240/23171320534.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/7fcad4081965c65342b3b9d84f0d24b6/39621117633.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609443bf28299---vetujoforuzebazon.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acece94cb47---79287779119.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16076d14c8087d---5271947384.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/17680243701.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/91687535347.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/komopomirotenunini.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16072c6db26a37---dapifif.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/5b10431a5880c7b93b6e26bcaadcf848/favexuxozenagesi.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4551e51db---65097155360.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161296ba11c68f---lozolejekopov.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/lajanalifugotikomedenup.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16089f2cb0375f---93458412522.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/5331269095.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/sepegepisojizox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=triple+integral+in+spherical+coordinates+calculatorPDF 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_off0000c651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC651 18836 bytes
SHA-256: fa6719333341cc2cac8400b28603fc2392ac639e01a8c3ccd1006c9ef931a819
font_01_sfnt_off0000f787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF787 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9E 10856 bytes
SHA-256: 6d375b0fc02318aa5f720da30e183c73f67cc927d80caa0e1f08d4c6c5d0ec04

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