Malicious PDF — malware analysis report

Static analysis result for SHA-256 19957a96a4c43af6…

MALICIOUS

PDF

108.2 KB Created: 2021-09-05 00:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7d09df27bb5979900df7eb3f41c2e2f6 SHA-1: a7f3bf669c26f278dc5fa965dbd5a160ae113384 SHA-256: 19957a96a4c43af696b00d461accaad7b24da21432cb7d680d0645111aee3fe1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards an attack pattern designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://zuche0551.com/upload/file/daxosadix.pdf In PDF document text
    • http://envisystem.com/upload/userfile/files/lugelobaragenino.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/5516767db43d316c8b300c91508cc439/mojemoki.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/neputi.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dde43825a40---39558724951.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202108132300117890.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/ravesanomufusuborexebim.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/kugugazagolofepezu.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/wuvaxonuwilor.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/rkc0tdj32apr4j1ja6806d646l/86156795369.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee85d0a9101---zepasatijubenelomuvugek.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/80346133118.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/dadapexivaponipupir.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/gepisok.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7dc052812---weluwevumagunijepowug.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/0bf8mr46ts4ks54ke3eimskqlh/72784346171.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609717b42ded4---80881704468.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a9f042b9---nefax.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/fa3lbtcl0tmokl1mbhivct9v51/26635181105.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/724445076.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/916cc71d99fb81a54cc751181e1b7a40/23927528665.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd79d5279c6---70760152715.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=article+review+on+human+resource+management+pdfPDF 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_off00014088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14088 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001589f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1589F 11300 bytes
SHA-256: e75f77205488986fc829b67df0b1e74f005f61483c3bad52552f2f7ce17f0306
font_02_sfnt_off000172d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172D8 18696 bytes
SHA-256: ebe615dcbce5c802524ae98f002933d62552cb14054a1b3c4094b742835ef126

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