Malicious PDF — malware analysis report

Static analysis result for SHA-256 b10ae9c7e6719cfa…

MALICIOUS

PDF

89.6 KB Created: 2021-09-23 17:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 09fe5a2e3965360620933e4319b2766b SHA-1: f55b22861823c9dbb266b54f24cf052a859bf042 SHA-256: b10ae9c7e6719cfa2837358cf8b1ee1693d2b5f203424ce74da49b27d88aa760
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many pointing to compromised WordPress sites, indicating a likely phishing or malicious redirection scheme. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. Although no scripts were directly extracted, the nature of the links and the ClamAV detection suggest the file is designed to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://drafthe.ru/uplcv?utm_term=hack+through+link PDF link annotation
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613283fb6d424---fivuwavoguvedazejaxusikef.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/wuwukidurex.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/xofugujaxadozobipumuzawa.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/13906787272.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109071028265412.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/xuxebibekovowif.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/sudebowew.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/bpvrc4ol7hu5ct0hl2ce8im20u/8897040394.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/53017588557.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/tu319ra9728ri4l7rlaoqgtcr4/17497040059.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/wipibutadozib.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/sixodefebamojapawevakeve.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/90742451317.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb1f67c325---zelepekuv.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/vajazezas.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/vexutegozaperisa.pdfIn PDF document text
    • http://video-cycling.de/files/file/memimubiwoxed.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/sebez.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/21282295467.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/vetekisi.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/ithtrind4q7l95ioqnrivop12h/numij.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/wurepaw.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/xufeki.pdfIn PDF document text
    • http://ausafe.net/images/art/files/85522532281.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161476995794f8---ribozazufupebojama.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D7 18400 bytes
SHA-256: ce18f860e5e68f85551c97be5c98cef8ecbec2fd994c324d77bdd8f42d821ed0
font_02_sfnt_off0001412f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1412F 10392 bytes
SHA-256: cf8419cb90409997d240065ded32d365d808af9e460af7c9f741bcc779e072a3

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