Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c7898a8b269b48b…

MALICIOUS

PDF

85.1 KB Created: 2021-07-17 14:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 52c582a99ad284ba75467b0c21f12dce SHA-1: 850c26272b5ea3dc56c769b51d6814d06d461ac8 SHA-256: 1c7898a8b269b48befe5d5227543cb59c13973a5a6c673b165b24b830cace3d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to potentially compromised websites, many of which host PDF files. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics indicate a high likelihood of malicious intent, specifically phishing or malware delivery. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://gtshotel.it/images/file/64314825477.pdf In PDF document text
    • http://waypl.pl/upload/File/boxiwa.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/tubewu.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/38836857637.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086150b76976---26797587228.pdfIn PDF document text
    • https://businesslife.com/content/file/gimokasel.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab673655916---saratumo.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/84585433758.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/32943787190.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fff8cc060---vajekepegodabaxuno.pdfIn PDF document text
    • http://guowangcable.com/d/files/xepemevopasejesizobo.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/2157a718501c573b7c246f04d1fb1f32/25561069362.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/cipi677dqqbof84dvuqfqci9rj/vifewubajolelur.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/85619748762.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/febinemisitezomalutudebuk.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/60221673148.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/fazeviwoziritev.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/5fda5ff33d35e85a0efb5a4475a8f19e/bosironubuvebebosezer.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97459277594.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/sefuw.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/69456534727.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/96118584192.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160de8d051d319---65289042368.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=promotion+in+doubt+letter+samplePDF 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_off0000ebbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CD 16604 bytes
SHA-256: 6eac439ebba5dbd93d77b1eb56d57ab2bcdef5a068ba1c8be403295a5fb3cc65
font_02_sfnt_off00012e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E95 10792 bytes
SHA-256: 50c150b53701bdc0e56ea41e552c6da3c5273e00fcb2a9e5fc16a3beb3768087

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