Malicious PDF — malware analysis report

Static analysis result for SHA-256 c02b70abe23c9698…

MALICIOUS

PDF

72.0 KB Created: 2021-10-01 08:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 11227141d168226f065e7002bad0c19f SHA-1: c85b9d01fed0896f7806893c5e2cf7fdbffb3470 SHA-256: c02b70abe23c969820d670090870a16f9582bb4cc8e5a6894986d99e22c0e079
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm structure, with multiple URLs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The embedded JavaScript is the primary mechanism for executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://jamalcar.com/userfiles/file/fonemesamezirotajomo.pdf In PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/raxapujewu.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/zezarub.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/25337034408.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142be65cf4dd---bomaz.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/zoserojuwe.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/kikovamidokedinisulala.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/21385738722.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/rupem.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/29334516354.pdfIn PDF document text
    • http://autoescuelatosal.com/galeria/files/44020994400.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613271e8c389d---7315715210.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130dc359e77f---38839860355.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1614ff75e00d47---94302839666.pdfIn PDF document text
    • http://freestyler.cz/img/file/tuduvawubogazubaterozor.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/66304441962.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/wovibovubuguroguja.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/614e568f9bd78924e22fb0b36266fe77/moxojon.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/53877743837.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/fenanefukasosoto.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/wubiwunolanogodimif.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/kaxosefevulujosavuvafax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=photo+lab+pro+free+downloadPDF 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_off0000b32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB32A 18764 bytes
SHA-256: 0a177ccd768482c13c6f3bbe6dd2632ad6ec49dccdad475d7f7b15fa8dbfbbf7
font_01_sfnt_off0000e30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30C 10564 bytes
SHA-256: fd07e4e19e2a8ef98aef27a39ab625fe48b3f7f8d8d9bec641e6c62cdabb3236
font_02_sfnt_off0000fae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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