Malicious PDF — malware analysis report

Static analysis result for SHA-256 74a6e2b8abaac123…

MALICIOUS

PDF

83.5 KB Created: 2021-09-20 00:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9c646f5d15fac0a8810004bca3441a95 SHA-1: 0ea77b5209b5e422947f8a52f903f246debb46a8 SHA-256: 74a6e2b8abaac1231ed2c087fe93ee5d6f19500906ea5c50198d6b21ffb599aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nomylo.ru/uplcv?utm_term=phone+under+30000+in+bd PDF link annotation
    • http://candientushinko.com/images/file/24457770212.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/rawojarotikagezuvo.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/domenevalor.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/sakafebefarudit.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/zexodefatup.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/65214953702.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/84237032692.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/fotijez.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbddc179e9---vofawumobimefiriw.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/67198599616.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/27627083924.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/49116357821.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161335dc1f1a28---sikakom.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/19e6de18bd8a1201c8ef7299d540c367/rutelir.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/b44c55174b7b56f9cacfcd5e3f6af549/83054294974.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6e1bb79fd---ziwewukugarumoposuge.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/8902105494.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/paragolepotewajowanutejut.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/78380303480.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/bekutoxibapusoloronov.pdfIn PDF document text
    • http://orenprom.com/img/account/file/95218781320.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-3/20210903080807561942.pdfIn PDF document text
    • https://migger.dk/userimages/file/15614670883.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_off0000dbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF2 20028 bytes
SHA-256: 8591bee8b50d62c4975cc92e63ad8fa78c53c6e996599db98de2afeac3cb072a
font_01_sfnt_off00011109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11109 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12920 10408 bytes
SHA-256: f53965088ba2d9a4a6fe00a384ddbcf0bc1e81562c63525d8e848cd4ccaa394d