Malicious PDF — malware analysis report

Static analysis result for SHA-256 342b8830b99a9756…

MALICIOUS

PDF

92.9 KB Created: 2021-07-20 01:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b5a444dee204f5e08f30c34b7a0fb7b9 SHA-1: b35c35898dd390183898971ddebcdda55927bfc4 SHA-256: 342b8830b99a97561fdc6f6a7c330b5b7130665e4c1cedada0b14128ce0c3c8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggests the PDF's primary function is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 http://allamericannursing.com/userfiles/file/98994230116.pdf In PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/61828307821.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/xasuw.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a5ab837bb---magexeguwekubusosimabaf.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/7014940162.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607373cd6527b---748479126.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/45844831938.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/0837da396888b226f58439b0db25fe3b/faruf.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/67848913307.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/wewegitom.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/xorotetaposeminowebol.pdfIn PDF document text
    • http://shadesvalleymounties1969.com/clients/868959/File/bidobukufixoged.pdfIn PDF document text
    • https://preciseenergygroup.com/media/supovajowe.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/dn9mg17gnhr06c5im79hsd2jjt/65008991215.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/4a482ee818c4fe1b63c6e8eec478bf37/52980323822.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094d8b161521---25598533795.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607445b0952db---34014402500.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/71113314506.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f3b2b22e---18845167280.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a8ab211dd---96487641174.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/gobotedelukafewo.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/87073596142.pdfIn PDF document text
    • http://churchillreunion.com/clients/72216/File/ginojudizibexikutukuvaz.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/8526105250.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/ximamogusogujonodonojaja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=adobong+spare+ribsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF484 10544 bytes
SHA-256: f15a4cadc6aee64b413cb503b1f9aaf81527bc0c77c607ba663392a351604a71
font_01_sfnt_off00010c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C34 16828 bytes
SHA-256: 494e9046561fdb5fff727d3738ceb9e108832d0dfafc2f67db58afb05fbe3f5b
font_02_sfnt_off00013820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13820 16340 bytes
SHA-256: 88a5f3ad9079b2340172ecd64f1cd79ba1ad1753eb2b73e58de10c5a7be67d15
font_03_sfnt_off00014e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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