Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3b12ecaa83164b5…

MALICIOUS

PDF

74.8 KB Created: 2021-09-10 23:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 37b325e4d50fa82e17851c8d528faae7 SHA-1: b5310c826fd5a3fd53a3f569a92aac38ae17da6a SHA-256: e3b12ecaa83164b5f4b78e3c2e11445184734681eac509a14f2b543eefe5392a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS uploads or disposable domains. The presence of external URIs and link farm heuristics suggests an attempt to lure users to external sites, likely for phishing or malware distribution.

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 http://wych123.com/upload/files/fupetelubemipixofuka.pdf In PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/matuxesowisonemogu.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/dutul.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16132f0f3c1f7b---gigotudilubova.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/6bace6b2068d30f46c563512b7fef05f/kopofena.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/39228849280.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/wasapijepetiru.pdfIn PDF document text
    • http://safarang.com/basefile/files/fefivepedivalogopoxegex.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/6582806489.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/3888920234.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/seperaxufo.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210909045110116.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/selibiwusesuvukifuwilo.pdfIn PDF document text
    • https://x-software.cz/data/file/4488509950.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/19352790333.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/99882338359.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/56121834013.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/23831485542.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/rafafijazon.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/sipitalena.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/99061950655.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/68179740722.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b99c67db7---sexixenozamikuxasilozuf.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/lupuribanidirawosadorano.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/laxakupojolonufilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=varane+avashyamund+full+movie+torrentPDF 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_off0000c1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E1 16756 bytes
SHA-256: eea452df56f1935f27067b4aee043a568e1486df6e5b4d98c27c6ca066359b91
font_02_sfnt_off000104fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FA 10868 bytes
SHA-256: 8767e2fae7d374366e30c9730afafa3db6acfd2fc9001559829b7d9ce988d909