Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0820b3163fe4cd7…

MALICIOUS

PDF

90.9 KB Created: 2021-08-03 14:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: a16af9a5d2230cf0707642748075d129 SHA-1: c24d1f76ebe4033ba052003cd38d272a7b222997 SHA-256: a0820b3163fe4cd784b8b9d5f0fb63e22afc6dcccb60766aaad7f2854305a36b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links, many hosted on compromised WordPress sites, designed to appear as a 'wedding invitation card template free download'. The presence of external URIs and a link farm suggests the document is a lure to download a secondary malicious file. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/uplcv?utm_term=wedding+invitation+card+template+free+download+psd PDF link annotation
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd5f8c398b---sesalekalemetudilezomaja.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0d1237401---sibovumijagunuzolepi.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/lizuzokovaru.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/75130622451.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cefed54d8---78709120767.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c454c2fb---vopikebovenosifidagodow.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/k3ou48uglp2ko16nr01uh0t9im/vubidufuxurikitususivem.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/nexawuritimi.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/44336f16fd144fe27c72a3a2fa1f9560/44207619872.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/46173229890.pdfIn PDF document text
    • http://nccutrackandfieldnation.com/clients/2/2c/2cea5a7e730406ee40dfbbde6098010c/File/45090754635.pdfIn PDF document text
    • http://belhavenhighschoolalumni.com/clients/13962/File/zawewarisozogutum.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ipjo0v1jlu5s62eu05u0ceib01/gasod.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086555c22bef---56434041319.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/nazebavukegelinazutojopa.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5206a12a08---lidigozoperefubemogidupo.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fc89490ba---10782847231.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/fovegefuwekefefenaluziz.pdfIn PDF document text
    • http://simonide.org/userfiles/file/70092909886.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/siwakuwipejojabisurur.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/seaf7ph37e8mlb3fqbbuvkv1o5/tirusiretubolu.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210706051918.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094725fe9bbd---34250204559.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/59573339090.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160df1fabcb330---zabaxuzuloduravod.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_off0000ff14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF14 11108 bytes
SHA-256: 2e66b6d958590258e3a41343c33d247b4eda7eeae9d95d4c323721df077b9908
font_01_sfnt_off000118d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E6 16856 bytes
SHA-256: d04f4837b933544bc02e1a15a5eebd257c249ef2f77b2f9d51bd9769dd0639c6

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