Malicious PDF — malware analysis report

Static analysis result for SHA-256 b10055845a487044…

MALICIOUS

PDF

85.7 KB Created: 2021-08-04 07:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8ad99e8b3d17ab86bfda7504edc06e57 SHA-1: f93d39b58f8c44fa664672aa923eeed83d4cfedd SHA-256: b10055845a4870446985ba43cabbe05791a1cc53739e6d956ebacaabf4ba77cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous embedded URLs point to external sites, many hosted on compromised WordPress installations, suggesting a link farm designed to lure users to potentially malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d859bd3050---26492069284.pdf In PDF document text
    • http://allamericannursing.com/userfiles/file/nidof.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/v0a3nrpnqq2962g5kia62gr2fp/soxenivitaxawune.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a31f27b03db---poxorusufox.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/90205111513.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/96239fbaa43e161bbaab8d3dfba6133f/21949447444.pdfIn PDF document text
    • https://pierreseche.fr/userfiles/file/42235475279.pdfIn PDF document text
    • https://12shio4.com/contents//files/71291231102.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/dopodinonoroxuwofewajafo.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/sikegorigenisobeboguli.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/neluwolejixipori.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/12436441109.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/54386038755.pdfIn PDF document text
    • https://avenue102.com/uploads/file/15706646058.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/j2fu1i7hi36jeqp1udcut3hbh0/luvederomilofisabem.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1606c93b98be42---38486507028.pdfIn PDF document text
    • http://randalljroutson.com/clients/44711/File/3960538575.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/fizonivo.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087402770c07---doxagi.pdfIn PDF document text
    • https://jurad.eu/files/file/lusujutozirurefanonelep.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/mikevoguvebikapidalem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=mapa+del+mundo+con+nombres+en+espa%C3%B1ol+para+colorearPDF 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_off0000e603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE603 18516 bytes
SHA-256: 94f5ceaa2e925f2a4f458cc8120131ab35d355a9ce773bf5a114af25785fd7b4
font_01_sfnt_off000114f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0C 10924 bytes
SHA-256: 8584e1cc73e13f5bb602b50460d7b846f4aa96276db0ccd49082e312f721cd12

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