Malicious PDF — malware analysis report

Static analysis result for SHA-256 48783455d599b632…

MALICIOUS

PDF

73.9 KB Created: 2021-09-14 04:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 52dc9b144f78022de475be43ad940479 SHA-1: 497fc0497b14eed6b3116f37402deec39c85e126 SHA-256: 48783455d599b632641236c0636e21b82a5488aeaad2da8537451b5a14468f7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161359f4d96bc7---xizogupuna.pdf In PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/rupiramidu.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/70412652861.pdfIn PDF document text
    • http://willbramephotography.com/wamuselages.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/fedoxuvavadanagefeba.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/f647a79e198dd104188a91617e7fd20d/16766853745.pdfIn PDF document text
    • https://iwistw.com/upload/files/wibisokid.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135537f37c70---pamojesemabuwola.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/kevexutezi.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/88594129072.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/76367562101.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/31532494257.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/95560384253.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/46050782119.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/puligugavosoduramikeso.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/66473375571.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/88717382848.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/74618739685.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b037d1d3bd---45463555194.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/13608933554.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b325d0c2de---visexegipuni.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/8d2702540afd584f92c461972f5b7a51/zinezogodifevijunewipuvuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=como+pasar+musica+de+pc+a+androidPDF 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_off0000bcac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BE 17832 bytes
SHA-256: e0829b78dab3865dbaa33c4728a22ac6001ab132d91abdc11c205b2fa756cdcb
font_02_sfnt_off00010204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10204 10660 bytes
SHA-256: 33a7999b69300025053fc9505b49453e0298576bd60abead829a416b5cbf168c

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