Malicious PDF — malware analysis report

Static analysis result for SHA-256 8904f90b88c27dbb…

MALICIOUS

PDF

93.0 KB Created: 2021-07-31 05:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 17035365be793e2f885f390e273397a1 SHA-1: 2f70615105c06e7d2e901f9c55b7bafa5398eb7e SHA-256: 8904f90b88c27dbbcc0af97d12f7a37e38ec82cc29e212792abfdd557f55188e
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a phishing or downloader lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cinstech-inspect-survey.com/fckeditor_userfiles/file/95155498840.pdf In PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3772064a0---23126914000.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/zowapuvedizemozibuwugu.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91750c9d49---79192101709.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/93356771401.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/82354466338.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c21bf0a101d---96535563617.pdfIn PDF document text
    • http://briarcliff68.com/clients/71184/File/totupivak.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16073791fe8d8d---rosubufomufulij.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/mifanelimugewomunela.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/00d7223ef14e6e383e1f977d04c51a56/88348543315.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/jujoxefe.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/54390889199.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/tularo.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/tvicv70g18o322vapo2u6osld8/lajababulogedukemojise.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/dilifitagumadivuj.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/pefabibusuduxi.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/86797789933.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/pozamunibilurizolojavepip.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c7289328a23---52453154287.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/bpnocus0c3j4114n9eo0oohfdk/83568329613.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/ae54ce850b870c66434cc9412191bbc1/75746960534.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/2112bafad25b27aead08b2d36e6379fe/50291215361.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ae765d0c4---56457845264.pdfIn PDF document text
    • http://petrduchek.com/files/79267996848.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3051c0da58---14885597920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=blockman+go+mod+apk+unlimited+gcubes+%282021+latest+version%29PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72C 1668 bytes
SHA-256: 0a4af374cb035e676210909e4790276a619635896d879aefac6ffd5912e9aefa
font_01_sfnt_off0000ff21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF21 11760 bytes
SHA-256: af4a160a27d396506116e69a2ad28919cbdae20b39d3d677a542be279ebf8cf8
font_02_sfnt_off00011afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFE 18744 bytes
SHA-256: 5531ead1d0e486856070e382fc4d964f9994cc6dab0cb921209d93d297d3045c
font_03_sfnt_off00014a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1