Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f5d52987bbcec14…

MALICIOUS

PDF

123.0 KB Created: 2021-06-29 00:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 9ded2fc0ad39bf8d0ea2d7c919f1c110 SHA-1: 13d2f3e731a9b0f902af70273256c3aa8df2cb5e SHA-256: 3f5d52987bbcec14a8db6177c6c8b169486cf1d113ae2b9a106b3d883ac34698
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating it's designed to redirect users to potentially malicious websites. Several URLs point to compromised WordPress installations, suggesting a tactic to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://cructi.ru/uplcv?utm_term=i+hate+being+alone PDF link annotation
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e0b1ee4d9---gujiwisidewef.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f8aa526fd---43853671519.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/97680734326.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/65204969760.pdfIn PDF document text
    • http://bangkoksolarpower.com/syner_upload/images/files/jagijew.pdfIn PDF document text
    • http://cucthongke.vn/userfiles/file///65029754185.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/b7317f2feec1c1e714b968c3101ac25f/70135669357.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210603_165354.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/tewili.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb1c33d8ad---wetogerazijinanamariles.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/sujavizoxifof.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/mleuegfth504l060so9t6qfve6/73667388553.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/10301790287.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afefd252a50---53749141754.pdfIn PDF document text
    • https://ttnthailand.com/upload/userfile/files/podetevagibemojefoxa.pdfIn PDF document text
    • http://cjatkinson.com/userimages/5070180605.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/83205822412.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/30479223827.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c4fdd2cee---zujaba.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/vokinudasugu.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bda2805c6---85471599086.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/84342278836.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/jusokunez.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000193b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193B0 20516 bytes
SHA-256: 649083c00dcc79b76c97071437b615166f60259d00d0483edfaa28f1f9d2b93c
font_02_sfnt_off0001c6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C6A7 10208 bytes
SHA-256: 4cfe7fe2847a125efa2c6f4c228bcb408de2b37a8d12512b338b75550fd148c0

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