Malicious PDF — malware analysis report

Static analysis result for SHA-256 567a9ed21de8deed…

MALICIOUS

PDF

90.9 KB Created: 2021-08-01 04:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 36a0960c0a7520e3d66e727cac192d7d SHA-1: 7a83171c9e99b14a056ec35177be1ca7077e885d SHA-256: 567a9ed21de8deed381f84699aa50942150dc0553116f8d89c6b4043bc0b7f2d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a lure to execute commands via the clipboard, a common technique for downloading and executing secondary payloads. Multiple heuristics indicate the document is part of a link farm hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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 https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/dca350976760a835d387807b23d40c70/55785763480.pdf In PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/d645675cf508d734a9e6320922b46d29/18699973261.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b01e5bb9c154a0fd82b776fbb27c32a8/tiximilufapaloxazawasu.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3c7ab1816---rojikuxizevinuzodalep.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/zuvexedakoveri.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/25680180132.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed53b05a5e---girakibepajewi.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/174d277a58f61b324158389d4ab36e0a/96955437135.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094b1b07d200---vapesijipazupolotiterugef.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/65568335885.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609796cf6416f---lefomodosewijizazixe.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/60391745692.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c192ff69f02---zuparibowi.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/efd9943054baa9713985b440954d882d/90814491222.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/gisozesixawiga.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf306c1f76---lasepom.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/wibarineva.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/161010eac5d960---sijusoguki.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/76457927699.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/199ca4fed1eedcd04645a0fd107a7275/gekowoz.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/62627196833.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/39ctb1isj6tmup9mm0j10fmkho/zadinalefuz.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609435e04e8e7---74390863723.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/72532632837.pdfIn PDF document text
    • https://motacademy.it/file/11201563275.pdfIn PDF document text
    • http://nakakinpump.kr/fckeditor/upload/file/5619975235.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/mjou0lofd710hmge6js9hhg6fj/vixebubozujabugepiluvowa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=fancy+handwriting+generator+copy+and+pastePDF 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_off0000fc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC82 18064 bytes
SHA-256: a8ca0e9a1b08926f2e1faba6bb66c914e0e9afd7368ba44e2cb1d757325ec3b1
font_01_sfnt_off00012b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B43 10924 bytes
SHA-256: 37212e806a68f2d0f0cd86880e3e35da5e9eeebf1e85f81aaf74aff740893b92
font_02_sfnt_off0001446d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1446D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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