Malicious PDF — malware analysis report

Static analysis result for SHA-256 523257347059bb32…

MALICIOUS

PDF

79.5 KB Created: 2021-09-17 05:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 63ae27ac8269e8037953cf0238e4fcc2 SHA-1: 671ec5974716c180e4e96fe310a578919af69687 SHA-256: 523257347059bb321fee6b1174e9def40e0d1dcd04e669f18b3f92fccccdb8d8
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the rationale is based on the heuristic findings and URL analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143f990a5d7d---34052974633.pdf In PDF document text
    • https://bio86.net/userfiles/fichiers/niviputowebuxo.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/54747366451.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c777fb4c70---60176254049.pdfIn PDF document text
    • http://gsnursing.in/ckeditor/ckfinder/userfiles/files/tunofaz.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/34368994110.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/61201792864.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/34134843253.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/fuwizizozotus.pdfIn PDF document text
    • http://joomlacode.org/fckeditor/editor/filemanager/img.php?file=file/33971128913.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16134485df066c---88253568404.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/78879952029.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/sirinovirunenevamirol.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/katozopuvivamomiwukixov.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rexigat.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/refuseliri.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/goxexodenovirejoxubuxu.pdfIn PDF document text
    • http://ingatlanfelugyelet.hu/uploads/file/lawuxadipo.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/tepifebidozo.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/zawesaxixemawimobogi.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161303875531ae---wifaxatap.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c42c0db39a---giginalofozo.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/32602954397.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/85968170957.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=breaker+fun+mod+apkPDF 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_off0000d31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31A 10500 bytes
SHA-256: 1845e982db85bf5a424becd2c0deac4d2f454471d1e6c2625eccf1b983d0d2f5
font_01_sfnt_off0000eaec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEC 17312 bytes
SHA-256: 02c34187bb0289b43b51c7664d069fa7c7559b0fbe91ce3ed0765de2e5d26d36
font_02_sfnt_off00011815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11815 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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