Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddb2723b40e89781…

MALICIOUS

PDF

89.6 KB Created: 2021-09-11 22:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b1906d9f5522cf7d4f97efe0ee2bbfae SHA-1: 0035fc9509793f00b18723d64f8413171cfedcf8 SHA-256: ddb2723b40e8978113971fa041fa380cb5178f1a176f3bc78fb0ffafeccacc2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or malicious redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=which+is+the+best+pdf+reader+app+for+android PDF link annotation
    • https://etadelloro.it/images/file/bibun.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/nikilimoguxesilinowexe.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/fubogolotusifuxewosepumu.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/99226929430.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/57239122401.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/nalebadaliloboduludeladu.pdfIn PDF document text
    • http://asqcert.net/files/files/kilebowarug.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/161315a4363549---82914618660.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/6458604833.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109071306347221.pdfIn PDF document text
    • https://esz.jp/img/editor/files/moboz.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/ripazagino.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/55577742139.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/biwijifun.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/nurijujaloliraxetu.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/46962906401.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/052a586e8c65abae963b2603d5a7bf0a/lubowubuwud.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/42565128939.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16132f0b31458e---beliz.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/kovesesuwofod.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/worizexigipaw.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/32738993389.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/60115540466.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/masukufaxodukenilevebu.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_off0000f8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E1 17876 bytes
SHA-256: c28f49cc7f98f5ab40b908651f0bca6966c4b4512ef476dfb8ff4c8c9ccdd257
font_01_sfnt_off00012756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12756 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F6D 10804 bytes
SHA-256: a286ec8422ba17c851497d9317f7225ec0d6878c8eb278c56aa1c8e55f07b074