Malicious PDF — malware analysis report

Static analysis result for SHA-256 173cd20673c59a39…

MALICIOUS

PDF

72.5 KB Created: 2021-09-18 07:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f83072654b95c271763c92fd78518bd0 SHA-1: 1398b8498093f4d159bdb635b4cb4afe361b56a7 SHA-256: 173cd20673c59a391fb9eac12b0f382c52c450194ce616fc00fc9a655a4c8af6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to potentially compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the heuristic firings strongly indicate a malicious intent to leverage external links for compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://appartementslisa.it/an3_Uploads/file/69122213362.pdf In PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/6143426729.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/6718563290.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/75208137430.pdfIn PDF document text
    • https://priscar.com/documents/files/28001526443.pdfIn PDF document text
    • http://foxadv.net/file/78534305655.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363e1d67bd6---38620180957.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143206338f77---81683104767.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/beviwovenogadijasuteker.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/lemaxabafezatefujo.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ffdadd363---kiwovatibisoxisirejixoxap.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/5447341840.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/9fe2ede93ebb43710bbb665d95e12228/jaxujutov.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/161405f77600e3---tuduna.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/57465579556.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/moxotimoxanipumujobigur.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/4cd204b27a1c284807654a5dbd319170/jonunopawekabo.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/lololonij.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/butujizo.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/pubaronus.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/velozuwufurobijifopegu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+conjuring+3+free+watchPDF 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_off0000b54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB54D 17684 bytes
SHA-256: a1e62764df2aa01b880948e9260d0f5a460cca36149d7c2caa06ad2003dc58ce
font_01_sfnt_off0000e35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35C 10852 bytes
SHA-256: 47996d635f6b9f8781f7b4072eb952b1f133d59115a71345bac49ca6e7197941
font_02_sfnt_off0000fc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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