Malicious PDF — malware analysis report

Static analysis result for SHA-256 797855c322b51e05…

MALICIOUS

PDF

77.8 KB Created: 2021-09-03 01:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: adf3bb5de2d6e139459c227200ff8126 SHA-1: d813f1aabcf912d3fe5fba27813b5c3015630510 SHA-256: 797855c322b51e05bb36e308e59899e415d1626441f45f35e082444efc5cb4ce
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The file's metadata indicates it was generated by wkhtmltopdf, a tool often abused for creating malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://lotusromeo.fr/app/webroot/files/userfiles/files/lagep.pdf In PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/8je1vnajtq6pcg5hto3ot5265s/vonedenidofuxefoxoxeder.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/pikerelizomodomepeje.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/00f6ecf6c6f9da471bfbb62168e5e6ea/nupaxezulumip.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/3rt4u5od5gnfqds826csl06vq6/70557531222.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/nodanasamudefowave.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611600275644d---mapukuk.pdfIn PDF document text
    • http://hoacanh.net/luutru/files/zatodaj.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/56920568851.pdfIn PDF document text
    • http://dentherapia.hu/files/file/38414180939.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/19711269761.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160987708b23db---bududadulomujigixelezepel.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/romomajasiz.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/99378627705.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086060a03d5c---dodubagokugomaga.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/94057926477.pdfIn PDF document text
    • http://synhbio.com/upload/files/5827130529.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/vblvjh8inb25lgjii9ma6cc0v1/24032524830.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/ghh89ep1jp519jllkpjcpagh52/pigumasirijekolomudonavig.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160faeb006b8d1---33902425088.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/66359298703.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/32242905309.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f6a6351bd7d---96547866464.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/sikfki6jh2vgb7rfb6lgln3eit/kidilipa.pdfIn PDF document text
    • https://codecs.ro/images/file/lasabaziwuxebetokizilop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=descargar+diccionario+completo+ingles+espa%C3%B1ol+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_off0000c69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC69D 11168 bytes
SHA-256: c768b21711b4c62ea3a7d6fb83438e647b78286158a401528c750dae631687e3
font_01_sfnt_off0000e042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE042 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF854 18472 bytes
SHA-256: 9f372210aa92f513887a07fc70efef1f71f5c576a649fa09cfed0cc8a5b0b68a

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