Malicious PDF — malware analysis report

Static analysis result for SHA-256 df22d25a564fc402…

MALICIOUS

PDF

91.1 KB Created: 2021-07-26 08:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e1c41de5411dd4aecacd00fcd12fad09 SHA-1: 4c2f60fe919c4ae26eaeb05dd80c55005b7b4f73 SHA-256: df22d25a564fc402f6b80b472cbc34e5927806c9ec0dfd9ee92af007945f7008
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. Heuristics indicate it contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting a phishing or malware distribution attempt. The 'SE_INVOICE_LURE' heuristic further supports the idea that the document is designed to trick the user into clicking on one of the embedded links, likely to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://laetitiabernard.fr/images/file/fokob.pdf In PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/rugerafekufuxudokumisaver.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/pc5o6fs3smmq3jtkcvmbovg555/dajiredoxoriduwaguzil.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/bitajulixepudazeta.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/mowuvavojejojebonozir.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/59198211170.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/bezebijulopegekubijuvavi.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/4gsb1nrvaoalp0kgseosnq9dss/54722803814.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/45a3952e22dc6c1322fd384a014da704/vogosavopavodibo.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/0ba77ef5b2623e606a672d530426a2a8/rerazefuvadexudupizireda.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/fizakinigifitugelapep.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/59416225730.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/pebatenojutexupinitaza.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/sijudojevix.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/vgfglet2dkc2p49m52pqic2br1/50897454434.pdfIn PDF document text
    • https://kompaspt2.com/contents//files/28264433556.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/30607496464.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b75548152---10114828198.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/95ae7ca3d1594ad22d87544ead3411f9/83540699452.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/80850771108.pdfIn PDF document text
    • http://alkanboya.com/files/file///gebesokefediguwimadodimab.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d905e1ad4b---94882840962.pdfIn PDF document text
    • http://teaandtiarasottawa.org/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/volamodigino.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/fomekerigomitetezejavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=is+it+legal+to+carry+a+gun+in+new+orleansPDF 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_off00010111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10111 10656 bytes
SHA-256: 66ee24de21ab95a7f327fce87ca0a514e3332eaaebb8b6758117ac466de64d4f
font_01_sfnt_off000119b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B1 16976 bytes
SHA-256: f6c6bb56fb119977e73ddb7cacac3cb07b102f1e10a4a01688b3d04abe894f35
font_02_sfnt_off00014614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14614 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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