Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f7c56ce2033414f…

MALICIOUS

PDF

79.4 KB Created: 2021-09-09 02:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ce63180478917293ab31ac4735102272 SHA-1: d7e02244348124aba5cb5d07ffa1c3c400799a3a SHA-256: 4f7c56ce2033414f535fe1e52b951d57695685f86ad677885f4a3daa6cf40e6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://delaneyllc.com/ckfinder/userfiles/files/87659476962.pdf In PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/12513244164.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/46397945675.pdfIn PDF document text
    • http://villkasz.hu/editor_up/vixosukuvokamak.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/77719395469.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/a2dcae79643571b662c1fd381a647219/jagadakovuwesukuxo.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/29242055499.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/gijidivazoparu.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/banezegolor.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/670d3cb6899a9e9e0737bfcb372ef3d4/jajujijawumumixev.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/roxiponazegigewevite.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/2e488fcf85d7c5495a0c98579003ae2f/53579202234.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/bb82e5309504539b9233854152f2faa3/45536224506.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/jijapasoxa.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/mavudamivubekadeden.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/91963024756.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/80634224443.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/71959973662.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/74827823211.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/66844681197.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/42468773620.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/28085944341.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/zufegipurotijofatax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=veer+zaara+movie+online+playPDF 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_off0000d2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0F 10356 bytes
SHA-256: b3d70fa825866f371a3be57b562e11a7f8937752bc97ed712e2a250478909f7e
font_02_sfnt_off0001026a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026A 17848 bytes
SHA-256: e760ff3888b748fc96835e0ad87e277a9a4537983cc2b98c73116159a910bbd5

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