Malicious PDF — malware analysis report

Static analysis result for SHA-256 f21721a23ed6ca1f…

MALICIOUS

PDF

76.0 KB Created: 2021-09-18 07:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 120e31193cbca82f94df1f25d4ec79a5 SHA-1: 683e00a91fac32821f2b9e4e90d23439f85abe79 SHA-256: f21721a23ed6ca1f73ed8c572fa48c198a1053e7d53fee91de36285d2d3072db
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely contains instructions to decrypt a password-protected archive, a common tactic to evade gateway security. The numerous extracted URLs, many pointing to compromised WordPress sites, suggest a link farm designed to host or redirect to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec729bacf2---pizidovirifajuwik.pdf In PDF document text
    • http://abwingsde.com/uploads/files/75255841803.pdfIn PDF document text
    • https://izr.fr/files/69114516654.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/73946662255.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16133abc35cca8---zefelukirexarukuvawaze.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/73942846350.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/gapibadomidarovatikatiroj.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/zokilusonapo.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/30981065773.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/takeviludajeku.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/makajasofamasupepo.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161453640a786c---vunibologujutoguk.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/rakupos.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/zoditogowelakako.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/bebedeja.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20219754545695.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/pepekulemadikiv.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/jezemevojedosuladebalogin.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/79723972471.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/67032335280.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/94557578581.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/batofutujexupivojozik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=app+to+remove+password+from+pdfPDF 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_off0000c40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC40C 17940 bytes
SHA-256: 3917e4b43fde879c89d89481b19018f307acbe5ce6c6ce9fe7cdcda5be90beed
font_01_sfnt_off0000f2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B9 10548 bytes
SHA-256: 53399104bdefd1d4630666055e90401f5607720b05e99b7fbc38427fc998a467
font_02_sfnt_off00010aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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