Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf94a0a9162d37c0…

MALICIOUS

PDF

84.1 KB Created: 2021-09-10 00:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b36af440a85bd99fdfdb643203e67a33 SHA-1: f8bf8a0dfb9129bc305d72469eec54e90fffe571 SHA-256: cf94a0a9162d37c0c8028dc1419cb5bba5a217cadb8ca096f97867ffd5472252
216 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing lure, specifically instructing the user to engage with a remote-support tool. The presence of numerous links to potentially compromised or disposable hosting sites, coupled with a high ML classifier score and ClamAV detection, strongly suggests malicious intent. While no scripts were directly extracted, the document's structure and embedded URLs point towards an attempt to trick users into granting remote access, likely as a precursor to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://communeouchamps.fr/userfiles/file/zivusepenizosuja.pdf In PDF document text
    • https://fokusmedia.com/images/uploads/kurenikaw.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/veritivakixenoniki.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/daa467992d9de736f7cebaabdc4fee93/wivada.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/gilujozivavolezotosutiva.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/ralujefuboze.pdfIn PDF document text
    • https://ewt.cz/res/file/dokowidujom.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/3985061543.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/87078988649.pdfIn PDF document text
    • https://ms01bet.com/contents/files/54753293524.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c4f77cdd0600d719c4a28fca2a1f9820/fogob.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/satanelugelefomuvav.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137c8f98eb88---vumaranix.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/wamoxutarezuroxaxudi.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dikivadalukotomolopil.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/72978689135.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/59712071636.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/01f291df6b13ba88fba66af3e9fd67f3/30151242432.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161381e632d23f---nimedu.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/7450547624.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/fomagarikode.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/55607419840.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/11282178770.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+copy+text+messages+from+phone+to+computerPDF 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_off0000df5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF771 18548 bytes
SHA-256: e6dc7631c447b4dbec014b2bb17a1911adbcb0c4ac770f7f784e1b45d475067a
font_02_sfnt_off00012825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12825 11184 bytes
SHA-256: 37c6c1b118db05825a625641eec0b16e4beee8bc5e7b4c29ff23dfef177e8039

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