Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0aef82633403ef9…

MALICIOUS

PDF

95.5 KB Created: 2021-09-13 19:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 05e1b1d2c0cb94fe8cbc6d2d3ce78cc6 SHA-1: 53e2fe7811fa04086da8cda3374070913ec245cf SHA-256: e0aef82633403ef961ad13a7f10510dbf9c8ff235fc9f67bbfb766ef4e2026ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised or disposable infrastructure, indicating a phishing or malware distribution attempt. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports maliciousness. The presence of multiple external URIs and compromised CMS upload links suggests the file is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/88fb5941143d2d24ba79200fda135c59/82411597258.pdf In PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/jotitazoxexananin.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/xegajek.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/zosowogura.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16135245f85037---25043026306.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210901133307.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/vekegatidotu.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/36304410293.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/dagiwoserarajoxafegupubox.pdfIn PDF document text
    • https://mahae.hu/files/files/6149846783.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/28887879123.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/37200110148.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/kiripovinumoxakep.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/fonimajezu.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/69515820846.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1630597899.pdfIn PDF document text
    • http://saint-party.com/media/file/muwaw.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/lofonodasitebuj.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/dc18c22df0056763d0d774b5fdcbd38d/48307891622.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/jeturom.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/1651507345.pdfIn PDF document text
    • https://btegypt.com/file/65354058436.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/94586921115.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/fukasidimojozexetoru.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/tofigerukiwevasabome.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=tinkle+comic+books+online+freePDF 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_off000110b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B2 10432 bytes
SHA-256: 60b7965bf75adc7acba10b1d4ce6e78fd0c6699b0aa28ddaf5adb06450d1909d
font_01_sfnt_off00012847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12847 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14059 18636 bytes
SHA-256: 5af7e993acf842dab3de9074ce3798dcf240241753d590653dccb333e053ebb2