Malicious PDF — malware analysis report

Static analysis result for SHA-256 96751f7eb25b11ad…

MALICIOUS

PDF

80.0 KB Created: 2021-09-19 04:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6dba9ec3242315fe1aa2f4f7bd61ccf6 SHA-1: 6f6a7d3118703da50b80df43a4840ffb80551128 SHA-256: 96751f7eb25b11ad64e3c1b9f1e728327e012ea8a7419375ddd6304554dc8575
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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 https://nomylo.ru/uplcv?utm_term=how+to+create+a+parabola+equation PDF link annotation
    • https://regaluxiluminacion.com/uploads/assets/file/39881527834.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/77091225672.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/fexovuroveribidomisukeri.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/jemevegigazaledu.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/putigemujaf.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/95181256680.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/61861924441.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/67137030694.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/5493262503.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/9442441024.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/runubusozavofog.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/56360303373.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/noguturezezadoj.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/74370829482.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/94476193008.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/10278646790.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132fac3cac4c---56664828818.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/136tjgeqgeat4jv1vf1j76rhh2/46855925429.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302e0914282---99402306443.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/2407624613.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/44532140940.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/pixuwik.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/22851494344.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000fd18.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFD18 18420 bytes
SHA-256: 86214d52a0a6395a5cc89f69dc884857f939bfd95818bfa317b410757707785b
font_00_sfnt_off0000bb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD351 16180 bytes
SHA-256: e7f82e1e7a28783ce474dbe79ff2b968cd4fc9fa867f1125ef2cd43d6c3cd7c6
font_03_sfnt_off000119ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EC 10660 bytes
SHA-256: bbbc0b9746f014281d387de314a05df547c13e36a310b42b65b27ae717b3d2d9

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