Malicious PDF — malware analysis report

Static analysis result for SHA-256 8db96dedb50b59f3…

MALICIOUS

PDF

85.8 KB Created: 2021-07-04 12:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-07-10
MD5: d58dabfc309d92cf3592ab42fb8601b8 SHA-1: 01af1cc7faa9d0fdff6e8bd38a3988eab7345954 SHA-256: 8db96dedb50b59f3fceb9ec3f25de3ac93962cfdd3523039b14cde74e8bab027
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of link farms on disposable hosting and compromised CMS uploads suggests an attempt to obscure the true destination and leverage existing infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c887ad3d986---35445533260.pdf In PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddb5c59f92f---gibubotudolexazize.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/fa68e7c5cfcaaa26094b93b8e5028fad/69152554237.pdfIn PDF document text
    • http://amdind.com/userfiles/file/35642838123.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718c938cf7c---sadevel.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/pefakawinep.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160965c19734a3---32700845134.pdfIn PDF document text
    • https://dietmoitangoc68.com/upload/files/tavade.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/sawewebibax.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/kokobanova.pdfIn PDF document text
    • https://technische-dokumentation-hoffmann.com/upload/files/dimijalewuxaregizetoto.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/gj1a36s70q3d1rs5psg0i3fchh/79349335467.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/44070a80b176284bc558161db2f4af18/26894710531.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/477bc90bd5a3cdc443cc5c690cf6787a/1134010617.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/7426193601.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/tl550hk2d68j94fgb6ag7jf4h3/72308894569.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/00c4e1447bcde2966a8958448e05901d/somisividinemomulikazede.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/629f74f2b208f3558d313b768301843c/40123063350.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/73200508020.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/35664706601.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/2634529909.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c729e6e716c---viverumegogakawuluxew.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5f9a067fd---zojiruf.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/ea7971aa01ce0d54acf57752730903e9/67492767865.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/tmes1trec8kv3lo77uu5g7i5ch/fumurulisa.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/jsh361mt2qvndr3bnsr1rp1j73/26064901822.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=adrenal+insufficiency+icd+10+codePDF 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_off0000eefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFD 10740 bytes
SHA-256: 4b784842f97ec45e855450f5a9b5788f09faee5609d37be6f244f385a7f617a8
font_01_sfnt_off000107d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D2 16112 bytes
SHA-256: 74f4098aa8e29e5a79106cc135e130f0840ebab6efb1488954878ca0ee8ab10c
font_02_sfnt_off000131aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1