Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb9aadaf69ec29f6…

MALICIOUS

PDF

81.9 KB Created: 2021-09-12 23:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e69a296efb4f561b9cb974809937112c SHA-1: 60a51a4c11a5ca21f4866456bbc0cb21d049b7fd SHA-256: bb9aadaf69ec29f6b1bfd78b1f7e7580c5ac0cd6f6af60110be69db237e409a7
156 Risk Score

Malware Insights

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

The file is a PDF containing a link farm, with multiple URLs pointing to PDF files hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the embedded URLs and heuristic findings.

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://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/161338dae1675d---4995949975.pdf In PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/c0b74cdbbc7e4f8140873706214ef72d/bufapamibevelesajirotogun.pdfIn PDF document text
    • http://newcityhk.com/userfiles/82263347841.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/gotafogusisawa.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/lonijubexixafiwaz.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/l65dm2s7d4lltv12789ag2ggeg/wofodiwep.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/92365822088.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/c6a58c32bf400b0571fb03eac5a6bf87/repezokazekaxafujula.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/mokubasuji.pdfIn PDF document text
    • http://heureka-cz.eu/files/pozexebewonibagudowuwod.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/43510072363.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/31382654844.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d1efa3871---lugowu.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/todud.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/7121957315.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/kokipawimitekuvekowewed.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/23469779365.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/kodilum.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/36046193993.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/55835364919.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/sopob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=android+7+screen+mirroringPDF 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_off0000dc06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF418 18192 bytes
SHA-256: bc80eb5147c9515574b49c0a9117e8faa33592afd8f0ea8eb97f398c70304be6
font_02_sfnt_off000122ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AB 10440 bytes
SHA-256: a2a91f8619892c673bf5f3a888efd97eff6686d4e6f753c4a9b9d1ce954c4ad3