Malicious PDF — malware analysis report

Static analysis result for SHA-256 701cfbe36a147f30…

MALICIOUS

PDF

99.0 KB Created: 2021-07-21 05:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8ecfa27b6508f83eb2e7baf3968eda7e SHA-1: 9732787a92053d74089812fe7b096846aae8974f SHA-256: 701cfbe36a147f305fc50bff875e7e2c507178da49c932a5551c03dee253a1d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several pointing to compromised CMS upload directories, suggesting a link farm or redirection to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a phishing or SEO manipulation tactic, often used as an initial vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://agrilaui.com/userfiles/file/76775137041.pdf In PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/d8d2a6d357db28966aa813755347a157/javisosukum.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608635969890c---xogesuzesutu.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/53a62682cb2046a3c8432c7f8ef3c4c8/53500868777.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210505202704753.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/ff64801f99683d36f60e5261a1b345ec/33338297567.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/zasesixemogudumaw.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/t58984sgcb1g5pec13rgj7o871/67451710182.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/39255567481.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf68e8a4f7---99724462555.pdfIn PDF document text
    • http://accountingworld.in/singhania/downloads/file/48598706768.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/75918804217.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/dinuvogu.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0e00b09a4---sudepanur.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/76347511676.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/29070076105.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/vrdrsjeclb5k0rbdje4r5h8ta4/27790332587.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210718124504_48kr6g.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/7957624818.pdfIn PDF document text
    • http://geodez.com/pliki/file/94834124582.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/d8fc4c56a90298dca89f3c659636ee91/38770900350.pdfIn PDF document text
    • http://texmet.pl/userimages/file/bitigomerunukawisedujuwo.pdfIn PDF document text
    • https://pabrikangka.com/contents//files/bomumo.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/13934645662.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=isaiah+43+meaningPDF 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_off00012364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12364 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B76 16952 bytes
SHA-256: c5baf83e8afa977dcc3b05119b518d849776bd5a8d36775f87e6c6e192f4395b
font_02_sfnt_off000167a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167A2 10392 bytes
SHA-256: a0a31984ad3aaea2d6f71f6f983963ceb6c177cc3f735bf5b41560de73727af2

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