Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb56ee5d0ea4ec1d…

MALICIOUS

PDF

82.4 KB Created: 2021-09-21 03:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b15ee020bf8caded984e7b3aeda4af50 SHA-1: aadde7e0e6b6310a2504742c4a17180c102ac280 SHA-256: bb56ee5d0ea4ec1d2e61918cd3e3ea793bcce69cf11cddfbb0ef3a0ef44886a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous distinct hosts for a link farm, suggesting an attempt to obscure the true malicious destination or to spread the malicious content across many sites. The presence of external URIs and link farms strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=android+video+recovery+apk PDF link annotation
    • https://rjpexport.com/files/58371860512.pdfIn PDF document text
    • http://vaithun.net/upload/files/vefugemixixok.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/21181628066.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/kq3ieel46lgh31kotk8i5t7rui/95957302954.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/feburifisa.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/nabafonoba.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/tewewatajapabibivezivu.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/90100552084.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/11465889674.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130fff3bd27c---53557146758.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613780e71c18f---78693441981.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/9296340926.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/24978010697.pdfIn PDF document text
    • http://ducthanhtam.com/uploads/userfiles/file/69226830913.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/vusozajivozirif.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/karadejokakeperisigaki.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/xukuwigelivijapi.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021090808551880.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/33831055677.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614643fad8cd7---jojilalulavokagozexogiso.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/703pvo4v0k9retre2nllj3uhe7/19934232961.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/87f75c85482fce07dba3345310ec134e/xazidumexotaviropadopina.pdfIn PDF document text
    • https://penzion-palice.cz/content/89599982163.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/soxobexebol.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_off0000d86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86E 20008 bytes
SHA-256: 067149f2c9b5d909062f1d1ec0ee450097e628b180658c25f721e7022e5cb1a7
font_01_sfnt_off00010c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A0 10448 bytes
SHA-256: 13075c906960976c597d86b354571d266080656827fc3e97639d9836076392aa

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