Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e6cbc3256f48ff8…

MALICIOUS

PDF

101.0 KB Created: 2021-09-18 11:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 752d483b41b690e0ed1d82cf9e004d3a SHA-1: 34e07e91fe8c1a5e0a47bc91f755cd1d40f72755 SHA-256: 9e6cbc3256f48ff822757b10459999574e165e6ad8604778078cba7f39fe6cc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hotelamadeustorino.com/userfiles/files/4049587710.pdf In PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/68728135462.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/livamiwido.pdfIn PDF document text
    • http://benetalent.com/upload/files/65368475061.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/c2ab7b08b9a020c63110ec51904db529/16772853106.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/7mpd9l6666ffmoug25pe63afos/12149672993.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/68989098752.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210908_6D9C2961E73BF9FC.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/povuw.pdfIn PDF document text
    • http://zaiger.ru/img/file/xotezulobuxosim.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/196401fedd039e918eed87fa4bace89c/62525386768.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/161417a2dcad09---12749791313.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/sirajubomijopepa.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/36f103e539bedddf8ec817b985bdcdb3/95829433207.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/53277742530.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/60550978959.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/88346929676.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/loroxajuroserasi.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/guvetazifasixavalutobike.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/81442593938.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/90013988520.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b0d2b7de7---59988159698.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=shortcut+key+to+go+back+to+previous+tabPDF link annotation
    • https://easyown.ddproperty.com/datas/files/gipanetida.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_off00011cc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000134d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D5 20956 bytes
SHA-256: cc726ad4c6fe998d1d066978f4877f5ac70a6819d50d96484e17da82dab2e8dc
font_02_sfnt_off00016bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BC8 11088 bytes
SHA-256: 84684d639bdbc354519fba6d34cdd85b4a1159e4f9c27a0a048c035eb32712e3