Malicious PDF — malware analysis report

Static analysis result for SHA-256 1764cfc747034354…

MALICIOUS

PDF

76.7 KB Created: 2021-09-20 07:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 75f7b37aa4391de0346068d5ff35bd4f SHA-1: f8a7762ab3fe188ab9724722f5f7d06a5d737200 SHA-256: 1764cfc747034354eb62069be0db2c853e9f706cd7af6095c602919c4ee6f4df
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://beastyenergy.com/userfiles/file/benojuzodapovabefa.pdf In PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/wibimejubadu.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/1202001995.pdfIn PDF document text
    • http://partnercable.com/files/59985733870.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142b83f321c5---10959826593.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/zifinupigifibo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371384ea372---65216489514.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/pavukiraxidufipadedekebes.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/rinelonefigikalo.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e167a4a4c1---12323568297.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/kudufipijinuka.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0d705e8a3---37952961568.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/441777322.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/kadiku.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/tukolesusutowimixotosow.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3736c90a5---34744602467.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/57655125769.pdfIn PDF document text
    • https://alutat.com/data/file/lurilasemewe.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/wudufixasaso.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/35543180219.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/tuwilotapasitukujowodisif.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/nifikuboluziperup.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e8c9eb06e---27866914249.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/95611451986.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62576696537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=havoc+os+for+redmi+note+6+proPDF 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_off0000c762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC762 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF79 10960 bytes
SHA-256: 47e27150bc11b56d576b43639525d23372bbe235e931e553199861814a6ae73b
font_02_sfnt_off0000f8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DE 16984 bytes
SHA-256: fc6e47c4da7160f1edc406bbc3c738fc9c6fae974f8e0a23e4b69badc79e2ac4