Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b3e3e3f559bb43…

MALICIOUS

PDF

88.1 KB Created: 2021-09-07 17:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e19a44d9f2b8bf8e9be89787fc4f8c62 SHA-1: 43a3c02a54b91a16247941d035d74ef09c93e37f SHA-256: c4b3e3e3f559bb43b4069db7777e63f1c77b938cd9e91795864520a14be915e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=reglas+de+nomenclatura+botanica+pdf PDF link annotation
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/db95f2478be16b6dcef2ab5d2a86ba77/sasapuki.pdfIn PDF document text
    • http://3q1p.com/upload/file/2108121300440400035l55ac71zul6.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/zevoneboxukuvul.pdfIn PDF document text
    • https://istanajp2.com/contents//files/50882125151.pdfIn PDF document text
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/luxujipawexe.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/fesitaxiseki.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/b951930b008a192205698cdb26ead5bd/32040491804.pdfIn PDF document text
    • https://x-software.cz/data/file/34328382303.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/fofulegidutorabanoxojo.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/40412425880.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/totim.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/famigifejumedaxa.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/rejubut.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607569b5b7142---momulini.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a1a535055---soduso.pdfIn PDF document text
    • http://carsonandchain-ip.com/userfiles/file/39296630252.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160da3e8b31c64---55932894997.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/sivufaw.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/kixigexibutamekopup.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/47128758928.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/62075993122.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/sokaki.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/36452135152.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/gopis.pdfIn PDF document text
    • 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_off0000e7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EC 11248 bytes
SHA-256: aab385cdc979ece974d8f1e2c32274f07e94dd66f59afc87cc16d7c1757dcdab
font_01_sfnt_off000101db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119ED 22560 bytes
SHA-256: dc0c01fd28ca33a84e9447f1b8dc8e3cb7e99c1cb1f5a6f94c9bfd720cb28e6d

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