Malicious PDF — malware analysis report

Static analysis result for SHA-256 614efc381ec0a327…

MALICIOUS

PDF

95.5 KB Created: 2021-08-09 05:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9a8cc87d508601c984312f4c8a47a31f SHA-1: b553d5af4e70a1f822f60e53a10a2f5438f5c994 SHA-256: 614efc381ec0a32707197fae92c9b6b21fe90a0e30d57e30ccb55dd449384828
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the embedded links and the PDF structure are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e5ca7a58d---donijabaduze.pdf In PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/relegak.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/em907rlha4p9jjs8h2i7b24s6c/zoxokoxitutu.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/nelonamodatena.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210624_CD9872959C6CDF5C.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/21e7riv30tg34mh7unig93l2o0/bapuxakonebidafafej.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/26507436895.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/komuxotudikepimidifatub.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/sivutoge.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/gimuxo.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/6702195130866fccb59dab35eafd151a/75259493821.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/8955cfc28630921a6a8519677c31b7a1/purudutupisigado.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/ca587780312b4e2fd1d8f1c46aa7aec0/lazafegu.pdfIn PDF document text
    • http://totaldeliverancecathedralchurch.com/clients/2/22/22dae496a1749ae881e6bee195142b05/File/62298291543.pdfIn PDF document text
    • https://postelezmasivu-plzen.cz/ckfinder/userfiles/files/lemujolamuxu.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/badisutinadozejebuponolek.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6c0cceae81---45816312112.pdfIn PDF document text
    • http://watch62.ru/files/files/89531835339.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609493b877dcf---82097034917.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f6da430e1---wipepukokiji.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/jenifudiwotugowokiwelami.pdfIn PDF document text
    • http://www.puhito.hu/uploads/jelamirelemebakozol.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c60069b29---vakimedelobedexesinugu.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/37830b3147a0612f2e4c6f524e1465c5/76993669493.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=proteinas+caracteristicas+y+funciones+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_off00010e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6D 17892 bytes
SHA-256: 850585c07435c2f1b204ac7d91e7c919602f06be1f72ae33a2b6d3dee9dd6e69
font_01_sfnt_off00013c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C10 10780 bytes
SHA-256: 27475b53a00e02e0ed76d09cb0332d56779cbe57eef40cda5d197c6174906ebc
font_02_sfnt_off00015510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15510 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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