Malicious PDF — malware analysis report

Static analysis result for SHA-256 631649af30655c64…

MALICIOUS

PDF

95.1 KB Created: 2021-09-06 05:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 031c21c7e2c3b398a0b40a28a755827f SHA-1: 0b92d4975cf5fca0bd24e2304087aa1fcecf049e SHA-256: 631649af30655c643ef9df281c8e9f7b2100f93d7cedccb1da125ccc4858d7dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely serving as a distribution point for malicious content. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://medvor.ru/uplcv?utm_term=autismo+e+inclus%C3%A3o+escolar+percursos+desafios+possibilidades+pdf PDF link annotation
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608205195c999---721275241.pdfIn PDF document text
    • http://drshapard.com/clients/73598/File/ruwiled.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/lamudejigumavodaxepevaf.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/zabisemugalixeg.pdfIn PDF document text
    • http://vtaky.sk/media/file/98376889398.pdfIn PDF document text
    • http://minhanh.com/files/42311387303.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160973f5679c1e---67305003938.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/c6ec67cb837e00f6a473639046eba42b/xevimifo.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/57u4q13n6b0bvgl56ji3i9nkgv/21099611716.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/33303549736.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a98f1c04a6---nozuxinapagilusuzuxujij.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/dafuxitosonezes.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/zarimabate.pdfIn PDF document text
    • http://aweibel.com/Photo/file/zenozazukatuxevegevuzafu.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/66349315161.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/21179578031.pdfIn PDF document text
    • http://doyen.cc/images/upload/File/7166543833.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b2af9230ba9---tujuseb.pdfIn PDF document text
    • http://pk.mo/userfiles/file/83478369162.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/pht3dd70kukqc77d5elmvbjps2/ribokosivi.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/22750322630.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/tqv5eau5bhfc8h148u49n43986/25516576573.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/48380765278.pdfIn PDF document text
    • 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_off000105f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F0 20492 bytes
SHA-256: 5449df12e2dbb3a1a3cdf77ad56201d673f7839995ae2090005446a722d3d07c
font_01_sfnt_off0001391e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1391E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15135 11268 bytes
SHA-256: 5c520917d946b4460cfb370b025f7d5c9af6d179d6587fe937323a88f3e96f5e

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