Malicious PDF — malware analysis report

Static analysis result for SHA-256 1576003ec434b4ae…

MALICIOUS

PDF

88.8 KB Created: 2021-07-22 09:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6228cc70da40add33894ba3b78f8e17e SHA-1: 46ada81be3d155866674ce745cc17c2852c70702 SHA-256: 1576003ec434b4ae4a00da433237a170eb05df1f358ca4f8dd0b66d92af84c72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress uploads and disposable hosting, likely intended to redirect users to phishing or malware sites. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f34c6bccd7---88978140071.pdf In PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/eeba2ae317e1ce52e7a00620ade6067c/xogodafavofopuwufa.pdfIn PDF document text
    • http://samsung-service-center.ru/uploads/files/vabedubak.pdfIn PDF document text
    • http://guchenes.com/d/files/sisekijumuzur.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/c7360bd20b38408bd3cba939890fbc5e/fewezib.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/98e2ca6cace0a0ff2ac488e96f756049/ledeluno.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/092b4f720c82066259ff0ea9393a084a/gipusowisufelopamorebosuv.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/57679474955.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/37832492541.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/lutexamedogapegoviluv.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/95372392382.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///57487382587.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c552a71fe42---fuwetininixupibanar.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608774e9b0c8f---wofugivebujazomuximas.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/iut7a630nq2p89tma4a1biel31/zosanadebuxamodut.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/8388878345.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/678170f5b16e4a73b6b251180a4b656a/kenol.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609763187876c---46507061476.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607139c715ce1---56482214477.pdfIn PDF document text
    • http://change4best.ru/upload/file/mevutivuzuzeno.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160affd8dc045d---tobesit.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/galowevimubikesuligikuker.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=validation+in+software+testingPDF 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_off0000f821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF821 17380 bytes
SHA-256: 491dd955d555671f4a23b825da0315d218819268bde0413db2447e3804ac7427
font_01_sfnt_off0001257a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257A 10584 bytes
SHA-256: 976283495aea13a0abe7f3064efc2cac0607038caa94456afdb39f53c17aba46
font_02_sfnt_off00013d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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