Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b6a7ce53ef2de88…

MALICIOUS

PDF

88.2 KB Created: 2021-09-03 10:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e0750e25873059135caee81068e7a4d7 SHA-1: 31b8136543f0f6f7d8f492eaea2e35b807a81510 SHA-256: 6b6a7ce53ef2de881accaca781e919c27d2fdc8ce431ecf22734872a24777350
204 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a second-stage payload via a deceptive download button. The presence of embedded URLs and the nature of the links point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://chcial.ru/uplcv?utm_term=fruity+loops+manual+pdf PDF link annotation
    • https://kiaavcilar.com/upload/ckfinder/files/18462787584.pdfIn PDF document text
    • http://bjallstar.com/upload/file/xugusipow.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/27715102511.pdfIn PDF document text
    • http://candientushinko.com/images/file/zawakuji.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6abe7b620c---matubomoxif.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcea56c760e---90054094968.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/59226386105.pdfIn PDF document text
    • http://asja.ua/userfiles/file/58561498776.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/8v5tpel9ft7oa3msmv4s9k2ir5/barerarewejasoj.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/nuwusokoxija.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/98fff8ae3ad26ba439d668328e74bf99/tawebudapasegaxonegefij.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/41875595562.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/piviwo.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/697751872.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/13a22668c201b2dfd4ce796be5e34468/73417201001.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/54756449745.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/povexipaviruzebopewaga.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/degukugotulutokirabole.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/24467439667.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161059bf3501c6---juzutirek.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf8ca4e7b2---doxevi.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/71268780147.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc8c473d07---sajotavuriles.pdfIn PDF document text
    • https://seikai.jp/free_images/files/13189881058.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/b23d4b40d88826b4b80e3156d86a6e66/66790612555.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/nemufoparuriludukekezile.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/a5cce9a6fb3e818a0e25d9ff5b603c55/230123568.pdfIn PDF document text
    • 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_off0000ed54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED54 20740 bytes
SHA-256: 150d1a081100be305de0257536345814c890f435679e5f4e78dd2f536e170d29
font_01_sfnt_off00012250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12250 10716 bytes
SHA-256: 88866edeff2669ed65645ab662525f9836c5181f2884b7311cd670a2586e814d
font_02_sfnt_off00013ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.