Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3da06660638ad96…

MALICIOUS

PDF

82.8 KB Created: 2021-09-07 12:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8d1e7414cabf1be65b404a9fe8efd41e SHA-1: a0991bc669155ed2ac6e4911101d33e5cdd4dbf2 SHA-256: c3da06660638ad962f0c742f707c06850cdd802c4e57a5b88f21d7ceab5a1fdc
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://rfaaa.com/UploadFile/file/20210817111242463.pdf In PDF document text
    • https://arerp.kr/data/file///voratebojujotumiguzun.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/boreretisilove.pdfIn PDF document text
    • http://wphs69.com/clients/1/13/13dd0a1135c99f886ff4006aa3c820ba/File/bajobuxenixabedexa.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/ae46e435b58bfc3b6796940074e38b2d/xumomigo.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/36510962243.pdfIn PDF document text
    • http://cartopack.com/Images/file/xelalisenisuvagodogoradab.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e6606f78bde---josadewula.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/pabojuboxi.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/42336245012.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e217dd30274---nikowem.pdfIn PDF document text
    • http://gphs100.com/clients/e/e3/e3ed30f4e85b1ff1e74f61348c82e8eb/File/tejotusalosogax.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/ddpgo95tsb9efkgn89qs3ccs6j/59289912573.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/xumoguse.pdfIn PDF document text
    • https://kaimano.it/file/79187171722.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/jujutija.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/gv214uq2l0e8h8i0iddfr0k895/xanuxupovudupov.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086dfdd43c34---99646096390.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/60179199197.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/lipufovizugubuno.pdfIn PDF document text
    • http://dzbnf.com/upload/file///bujubagam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=gemstones+of+the+world+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_off0000ddc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D5 18240 bytes
SHA-256: 11a25d8110061e2f0a933ba4d6fcc4fbd004985b946227d4e0defdbd1194f2ab
font_02_sfnt_off00012545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12545 10636 bytes
SHA-256: 8385be2c0a4a9d4feed55356f652c10be434315ee98bf5c8f2da647064b2ec14