Malicious PDF — malware analysis report

Static analysis result for SHA-256 919360ac9571fe87…

MALICIOUS

PDF

81.0 KB Created: 2021-08-29 12:20:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: d3c0a347a30330c4b667f790c64abfa9 SHA-1: f9a7ae875e2bda07f2f7b36473a62c65bad9fa4c SHA-256: 919360ac9571fe87e8ed6abb3e8d17275aed601b4bfb048d5c1ce89a2861dd9d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a link farm pointing to various domains, some of which are hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of a 'password-protected archive lure' heuristic indicates the document may be instructing users to open a password-protected file, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://synerhu.ru/uplcv?utm_term=health+policymaking+in+the+united+states+sixth+edition+pdf PDF link annotation
    • http://posicert.com/upload_fck/file/2021-8-20/20210820052026254608.pdfIn PDF document text
    • http://kap-group.com/ckfinder/userfiles/files/92722783295.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//97390924637.pdfIn PDF document text
    • http://trevorhannant.com/degujagegerisakozabon.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/pilererif.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/bosejetetiruxadugokiluju.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/fetigop.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/86602950557.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608843649c486---wogikatufo.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/xujogeseruxoxomer.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/8b7afcf74eb2f2a7d2b0215c6c096839/27180310866.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/varitivoxen.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c3966fb9d68e9a702e786c383d8c76ea/23272232372.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/7kiuihk09bhpqtp4rhi74g29gg/lijene.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160886f7263731---muzalixanijobugonudajos.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16084be01543ed---duranomex.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/pemofatig.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/746ccce6efd29dcecf34f4c236600381/nogutimuluxibabitopevezor.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/2192577268.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/96431167647.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/nusefemaxaroliromalepola.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/55183015781.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/vetelavezezikanujofosi.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c0aac886582---72758309772.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_off0000d3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DC 11368 bytes
SHA-256: c6e6290d10dfb62190a3904f2eb2413cc93c7c6fc68eafebccae48a34a58d57f
font_01_sfnt_off0000ee36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE36 17820 bytes
SHA-256: feea090b9089c5c93881cb866b7b452980ea3a8bcc3b9852aed15e304bb52fda
font_02_sfnt_off00011c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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