Malicious PDF — malware analysis report

Static analysis result for SHA-256 15fb2ef353ff46fc…

MALICIOUS

PDF

67.7 KB Created: 2021-09-30 15:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 194a042c9beacd54428ea4a89f9b5c80 SHA-1: d9a62a8bfd9a381b25299700370ceadae98b94be SHA-256: 15fb2ef353ff46fca33cde441d74cc129a81258d0f3c5bf67f0e306cac46ad02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains a link farm hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The PDF structure and embedded URLs indicate it's likely part of a phishing campaign, possibly using a lure to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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 http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152f34a6e6ce---tetupawefigurufisidaji.pdf In PDF document text
    • http://akademibt.com/resimler/files/majixapujilituneserixa.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/nasufozekuxuduwok.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/fuxuwifu.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5051ada2c---18825134415.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/40678419613.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/momilupesif.pdfIn PDF document text
    • http://budropol.de/Upload/file/mukupupo.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/em8ecfnv9bccli2kbhv9i1r4dg/47371259221.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/5092913550.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/xobasomitazexo.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/02b33a3231973c5a86a2a0e8f4d84f35/57472785028.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/64815201250.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/18033488602.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/50068205892.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb0e2e547d---negerizarijuwuf.pdfIn PDF document text
    • https://agrando.cz/files/file/nozopepevovoxuzok.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/tigafebemajarumo.pdfIn PDF document text
    • https://dcimx.com/files/xusefunovazusesosujebepa.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/jimotanimedori.pdfIn PDF document text
    • http://topaslt.com/userfiles/file/96835206331.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=top+video+maker+app+for+androidPDF 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_off0000ad48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD48 10468 bytes
SHA-256: c7239947e4acc477d4a1ee17e6f30718321b31beb03c27cd4e7538fc4b73f75f
font_01_sfnt_off0000c507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC507 14576 bytes
SHA-256: 3be941570915cb1614405d4114bcb4546bb00cd88ec3244b97461c393442c6b7
font_02_sfnt_off0000e9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1