Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff4583d08c923b23…

MALICIOUS

PDF

73.7 KB Created: 2021-07-05 00:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4e55932c9c62551d6fb21cabc478ca7f SHA-1: a0a94dd0086950a3d099c563b5c97397714ef90c SHA-256: ff4583d08c923b232bd7b62973bd06d26fc027760da343428cd653bb9c55f5e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the primary attack pattern involves luring users through malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/26b9074dd13f5e87b6feca20313547ec/5673301387.pdf In PDF document text
    • https://cvsc.co/userfiles/file/tawutuputunivoziforiwow.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/ec6d36u56o2n24inedjfg5ikul/dizokepatekiwoguledo.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/23810034858.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210608045941472.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/dekupomakatud.pdfIn PDF document text
    • https://beliangka.com/contents//files/22331972142.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/jubeto.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/18562182536.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/dh36ukoacg3aftj9l9uv7418uv/37079386987.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/cbb7be0dc2743bedc61d0c8d8af24e08/70788072653.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d796bcbd7c2---54678164195.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/26be816f305037c6347d49c334f8febb/75129685244.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/kujejefowaregenikapok.pdfIn PDF document text
    • http://broadmoor79.com/clients/864886/File/dawazisarisuvam.pdfIn PDF document text
    • https://anfauglir.com/images/file/16144544724.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/g4vlfra9rdonse09vl5s473j90/54234081960.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/dofokasizasisukepudujava.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/bezizotajirugalazaz.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/32139299793.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/65801553430.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf188c1e813---3313649540.pdfIn PDF document text
    • http://arslanemlak.come/file/5532418062.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e71e9a53b---15421774245.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/61803978016.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=sent+down+meaningPDF 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_off0000c120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC120 16128 bytes
SHA-256: d6e40d56e0d0075a17421d21cc51fd81f6878834364eb35ec324a15a83650560
font_01_sfnt_off0000ea3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10256 10436 bytes
SHA-256: c498afd5d3e095801c501bf298a119782d8f542777571b93ee59c747aec3a9e6