Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bbe7ce30c3ab6d6…

MALICIOUS

PDF

74.0 KB Created: 2021-09-18 19:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9724d825093a06b48ac77e558be7d71b SHA-1: 3f8a0fba8cc161c210160f55599c7193fe28ac00 SHA-256: 4bbe7ce30c3ab6d60b3e96d09e77ecbfdc8b4876cd0c547b4663ff039d9bdf87
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/18322026086.pdf In PDF document text
    • https://natinsel.com/imagenes/file/lujoperurowesonotukopiw.pdfIn PDF document text
    • http://tnetimes.kr/upload/file///89718508184.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/vatefatapukotaxigalepetiz.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f01583770---lujozoxinudumojamawovi.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/26091535742.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/lalaxunizuvetajawa.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/39887468852.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/q21njlqsst9iac49tfglj0vqgr/37094848556.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/11562691899.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/vaguvikulekexusapax.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/92166227611.pdfIn PDF document text
    • http://ijfbn.com/editor_up/99561646489.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/bixero.pdfIn PDF document text
    • http://canadanur.com/resimler/files/56933104078.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/72512040948.pdfIn PDF document text
    • https://windsbs.biz/files/file/mosanakafanekaza.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/2860347233.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/43cfcb5976c8e474f773cc757de89e25/65879807539.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea9d14b1bf---11341286618.pdfIn PDF document text
    • https://luminex.pl/upload/file/87811570286.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/92970609377.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/56182214462.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/wogobofurutuze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=real+haircut+salon+3dPDF 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_off0000bd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD36 10784 bytes
SHA-256: c272f9079d8fb104a61654a072658d666e4303a344c4ec0e1ed7938737bdacc3
font_01_sfnt_off0000d605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD605 17208 bytes
SHA-256: 8b199b682c8534243b6ba1126a150e55527c321cdf62df9db35bbe5b7c505c1d
font_02_sfnt_off0001029e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1