Malicious PDF — malware analysis report

Static analysis result for SHA-256 69b46810ea7f5680…

MALICIOUS

PDF

69.6 KB Created: 2021-09-29 09:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b3f33e1c3d19b4b6eabbd44031b20256 SHA-1: 90d2a21ba6447821ebe3c01bd2e818b40c5f0072 SHA-256: 69b46810ea7f56804536a4a55d48afe9f7b962f153f546785994120242e90be8
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The embedded URLs suggest an attempt to lure users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbcec3f4c4---73421396587.pdf In PDF document text
    • http://ingpiazza.eu/userfiles/files/tetirugafiluketana.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/xusomojiruviragewikag.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/57569064204.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/sisozagutejepeju.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/wiwuxuvagixo.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/kowexejanukafejan.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210922_83CE2EA0E633FCA0.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021090819595870554.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138609cf12ef---jaxamuwu.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/22226470552.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/guwabosuzuz.pdfIn PDF document text
    • https://il-gusto.com/images/file/16889829109.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c1459758b9---nojulewojodimezotalu.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/tujirusebex.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/25645738897.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/farapufukumaduvomajevitij.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/zobovedakisajuvenot.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/63954929621.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/bosuzasuvozakuxumo.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/paxebabovepekujatojofub.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/kisilazo.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/fizisowofemekewuveveviwox.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/famusisavogoramuso.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/561607_66262848800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=harry+potter+prisoner+of+azkaban+subtitlesPDF 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_off0000b1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D4 10848 bytes
SHA-256: bf7724909a8d67e747a62f4d8a10aa20207edff352c8109127fb3a2f01b78ac5
font_01_sfnt_off0000cacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACF 15016 bytes
SHA-256: 6c0765a18f97157e5039e1f71d6027411d24ba2ae2879a6efc54676387cc03e6
font_02_sfnt_off0000f0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1