Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4912b1cae6a8e0b…

MALICIOUS

PDF

70.8 KB Created: 2021-09-27 09:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f968b31f2aa2a1f5684e64d9f86379b1 SHA-1: 0a828ee40c103c1d9e3663b35562863f1d5fffe7 SHA-256: e4912b1cae6a8e0be8e8e27de7a059e31a9c2a0245a61449846b67597e3d88fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is designed to direct users to potentially harmful content. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inwebjor.ru/uplcv?utm_term=baloor+medicine+book+pdf+download PDF link annotation
    • http://clinical-pain.com/pds/userfiles/files/bujowomilaz.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/gezowatemu.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/24168528403.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/97533445809.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/2cc514a32fce8964eaed9799be24d1f9/19346778248.pdfIn PDF document text
    • http://vo23.ru/upload/file/36501581267.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/guligililu.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/69033823844.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/raniz.pdfIn PDF document text
    • https://satesayap.com/contents/files/rapizupegujotajodako.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/gukulus.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/veridod.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/21456969100.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/maziv.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/2a25db262174869a5d8c3eeada2a8c60/2258676662.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/23105529074.pdfIn PDF document text
    • https://funstore.dialog.org/userfiles/file/62110591492.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/86350327023.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/vasunomugadomatuxonaniwof.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/divafowa.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16143ff80998ee---21408373456.pdfIn PDF document text
    • https://nhuadailoan.vn/upload/userfiles/files/31530429328.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/161457cbcdcc28---3298413480.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_off0000af0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF0E 17736 bytes
SHA-256: 88b4ebf794779ec443e7cdd2e47669f7797ac64a77f76aed81a0d9da51657245
font_01_sfnt_off0000dc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9C 10888 bytes
SHA-256: 4e3aa4332d9b03a4e807f733d76ad92b72ed716ae1deb03f5e37aef323cc5afd
font_02_sfnt_off0000f595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF595 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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