Malicious PDF — malware analysis report

Static analysis result for SHA-256 05507836b0bb8acb…

MALICIOUS

PDF

80.2 KB Created: 2021-09-01 07:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2c852e9dd1ad16280d07499aee7822ae SHA-1: 075cfc7859c3bd47f4fcded8619f010e97bb66cc SHA-256: 05507836b0bb8acbdb4598efdc4ca4b7c445b99ace4a5e6b5f19cb4ba7d5d4ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://agro-partner.com/Image/files/60184659740.pdf In PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/a8c2a333d0f2c80de2c295652963a5c0/buminisabeganu.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788e848438d---rodupexat.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/96725713045.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b128c0fd9---95570293679.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc7830ca3a---vazakesekixejubaruti.pdfIn PDF document text
    • https://hinaweb.com/upload/file/desowelo.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/28259861739.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3dcec8c8d---jumisufimomuwomos.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/17ae2e9468e58a4893e90274ee23f07e/refibanexiridumu.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1607350135f098---jugelo.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/pegixozedurew.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/gigonokalifowagibigu.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cf91db1895---morexutitugilokitajipojo.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/94773992654.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-8-9/20210809230004262608.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160bd91c180d12---63069924709.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160ba83cdecef8---35001312230.pdfIn PDF document text
    • https://susta.vn/userfiles/file/jegobunowekizab.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090622a9a8d4---68944643883.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/48897590381.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/80566189625.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/galonopejefadesoxomitanag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=a+real+estate+appraisal+is+an+estimate+of+valuePDF 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_off0000d5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D0 17184 bytes
SHA-256: cdfd642fffa232dba2832ce7675c6959aa0bc81d3e99e03405c8bb1a75656033
font_01_sfnt_off0001026e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A85 10664 bytes
SHA-256: caee37c4995e4552a1775b0cfbaaa68474568601b45fabb70b2ad8eb2a34ea43