Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc3155e09d2ffdbe…

MALICIOUS

PDF

74.1 KB Created: 2021-09-27 22:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 22806bbe23b41da42d817a4434cd1c92 SHA-1: 1a3f3e4dd76d2b2bff69c5b3d0c39ec38bc915b1 SHA-256: cc3155e09d2ffdbee76ce7c3951acc98d46d8d8e2c0b99195f94aa2381f57257
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://paillasse.hu/userfiles/file/32811250204.pdf In PDF document text
    • http://sozopolihills.com/userfiles/file/94676214139.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/1e4949c0865ccd749917b86a026ca50b/luneminigosunegokufasoj.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/5268b5952eac38ec88b22d8c00a8855c/sikitewulilogav.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/69684621869.pdfIn PDF document text
    • https://whitesal.com/data/images/file/1983_20210924042312.pdfIn PDF document text
    • https://kueapem.com/contents/files/miseredudexesofirebiku.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/wunuzalurotomodoge.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dab7cc1d10---19438580896.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/84225653223.pdfIn PDF document text
    • https://ulsantour.com/FileData/ckfinder/files/20210921_8984229CB245DEA0.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/kizigo.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/gipitogudipumatoxa.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/17642326719.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/nexivaroninav.pdfIn PDF document text
    • http://belean.pl/userfiles/file/difugovadopir.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/9407583081.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b22038ec83---56402407562.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/62761212100.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/20012575874.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/matafezavodowapirig.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/dasijomusegudowi.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109070003061794.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210904110111_6bv8hj.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/nifisuzimufoxujatexomeves.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=avengers+infinity+war+full+movie+online+123PDF 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_off0000b7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCA 11248 bytes
SHA-256: c4119d4dfd8bcde226edac4c17ec418569bc67ddd37db68a5a1a521f081485f5
font_02_sfnt_off0000ea67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA67 17808 bytes
SHA-256: f96ff6ade48ddf61fccb6f067bf8dc420d24037bb0c01fd9195e3bd13bd9430c

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