Malicious PDF — malware analysis report

Static analysis result for SHA-256 d46e7288019ef203…

MALICIOUS

PDF

87.6 KB Created: 2021-07-23 08:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9627bf521570d7e0ae17c25fc46fb4dd SHA-1: 4ba8e921304eb87c6705f1715b07b66953d58cc9 SHA-256: d46e7288019ef203cb079453bf8f96a30ac969983a8fbe1bd67e426d8a4186c7
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicate a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/p1593b19v85i5ibqc7hg41chn3/1717302142.pdf In PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/napesirugixovepubefizemut.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/tawopoku.pdfIn PDF document text
    • https://noddy.nu/images/file/datenadigitapezexaxa.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32abab96d6---77942155865.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/kp2ormd8hck13cvkvcrjmf7r58/toxepenovab.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/mimovobewakinima.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/43211807210.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160753ea701753---56960034913.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/dukodajuramixedopa.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/f5e3d8184e394a02972b009ae3ef6223/33261687151.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/cae6b23ec5ce61512833179455e46a8b/negilupegaxadatezowirobo.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/54311218285.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d15cf12d7a---modiwiviruf.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/fokadebilizopaj.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/xizije.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/wusumasedubamawagamufilu.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160700fa1a8a30---zeduvolurexejewo.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/obk9p0sc79e7v1rsntts75c382/47480651140.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/32761d03f908249d42c72fdd136ef2cf/firefasi.pdfIn PDF document text
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/b9o85r8bmmurbdhsnoinnhnfh4/57187844872.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/75038522341.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a31cfa1da8d---49618228062.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/b991f06d4611a9cfddf2a7d7b68c9864/filavatovesejorenad.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/5218826311.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084947e95484---raxijosalipovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=balance+in+all+things+wowPDF 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_off0000f416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF416 16716 bytes
SHA-256: 55407541e3381d7126828e8ee675c9269a7dbe629d48be81cbff4c066469a036
font_01_sfnt_off00011fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA7 10548 bytes
SHA-256: d3b76ccb3ba03432246f02308d14bf8255417da4817746a42a9241b5979c2eb1
font_02_sfnt_off000137c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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