Malicious PDF — malware analysis report

Static analysis result for SHA-256 83fa1a12245cd9c9…

MALICIOUS

PDF

84.5 KB Created: 2021-07-21 04:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b872fd289e9dd64b06f902bd3d48d48e SHA-1: ae766f1371d6d6648edc57afb54c00a2f3c3fe6d SHA-256: 83fa1a12245cd9c94e20c3b5b7f570ef27d79ac632199ba4f8543a56c31813dd
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs pointing to various compromised websites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://weyergans-hcc.lv/userfiles/file/fojipe.pdf In PDF document text
    • https://cargobull.cz/res/file/xifuzimabagora.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0bcd5d7b1---47990713350.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/dodl43idpcrb4nbdofrchk84p2/pusimulafiwal.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cf5c2f65ec7---80867232016.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/17178206647.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/e14369f6dbaa8dc0bc1e5c54e9f69904/lubedigejevamokuroxepod.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/56650914052.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/2b20ac4ab5f0e46b560ac4befe808a05/laguwewonidikipof.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/0a711e37c23a24cb1a7193326273aeaa/tujusuger.pdfIn PDF document text
    • https://kis-u.com/page_data/file/20210613085102.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/1c326a7e4980e356731065b8e3aaa072/53608848273.pdfIn PDF document text
    • http://helpibr.org/clients/f/fe/feaff840d005acecac0f151e8679c8db/File/pasatuzozumawazapub.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b9beb69fe---1548947946.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/vbs2139h7jomfhmplig5bdq07m/mixesasupik.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/18451220208.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210718_E80BE6084B7FFA3E.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/16877593113.pdfIn PDF document text
    • http://jar-ted.pl/file/wizirolawuruxepudofisaj.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786e3a80586---lafigijowerawaranebasedew.pdfIn PDF document text
    • http://smitheaster.org/clients/861344/File/fawikoziz.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cad28b1b949---radamugenol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=polar+covalent+bonds+form+between+atoms+withPDF 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_off0000e6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A6 11036 bytes
SHA-256: 4242f3ce0057f04d60794972539c758f82ecc3900f41495ea00a6670c4ec491c
font_01_sfnt_off00010035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10035 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11847 17088 bytes
SHA-256: ec418a5c194fe26dc9f1610d0333903fc6e48368c3ef355f83f40da0128e9616

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