Malicious PDF — malware analysis report

Static analysis result for SHA-256 184302ab18532e79…

MALICIOUS

PDF

87.8 KB Created: 2021-08-20 15:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d3af599c4da91f293006357e1d5b653f SHA-1: ce2df12ce4493727017d53ead30e8fdcf41d9075 SHA-256: 184302ab18532e79be1c06ed815ed35a738babaed71acdfb585a94523d87bccf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns suggest it's designed to lure users to malicious content hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://vico-immobilien.com/ckfinder/userfiles/files/83462988551.pdf In PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ca0c12bc91b012b500b5a1974295758b/40263536729.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/c4792eed7fdb0769364d774b11eb00c7/kivuwajubub.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/do62hv23d0vtblok3nm988u0m3/xukumiwaloluvofu.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/laroruvowebegipal.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/37082692515.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16115d1a4ceb4d---sabika.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/a2ff8f7ff720b8638c1874f1815ecb03/5996333911.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/80475926797.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/82687604832.pdfIn PDF document text
    • http://yejida.com/userfiles/file/vagoresokevo.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4d80b3989---dinoka.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a79d1de5c8f---fanoxakexulifagavi.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0a17712c---92064495766.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-8-1/20210801083335135097.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/75517460154.pdfIn PDF document text
    • https://capecoralliving.com/media/file/sizunabijuk.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/d65e4d39f0d1c67551deea3ba4fe9f93/puwatiteve.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/54063421726.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/1c7da92654c816305612bfa7e07468e2/28287802844.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7fb013ca6---wimavixadunabaduzidozu.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/692a800b9a84f5b2f95caeb5ba24bb6d/89592116159.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/f5617e1e74b5f67e3193e5c89cd84e0d/xeberudaga.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/90991796639.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+does+a+breast+tumor+formPDF 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_off0000f607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF607 16288 bytes
SHA-256: ed248508a526ba8234d57635d9f127668c7af96267eb2722abd2b7a6bfe63c4e
font_01_sfnt_off0001205d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205D 10588 bytes
SHA-256: ec37ee878818ad504fced19123f0c9f5871d738f555a74ac520c471f982cba10
font_02_sfnt_off000138aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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