Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c39225f2b67f98…

MALICIOUS

PDF

77.3 KB Created: 2021-09-08 07:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 62a00c1ea78529bf8c22d3c82e59bc00 SHA-1: aff717b66a54bf66f47351437128518c09568ed4 SHA-256: 98c39225f2b67f98a420a80ca0cfd8021ef0f0386e6008e97d0807b90e52456d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure, likely leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://eghamatyab.com/basefile/bainbookcom/files/53035548103.pdf In PDF document text
    • http://davidlbrooks.com/clients/868292/File/mibamejeduzunobe.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/a5d1d3088dd3d272b9ce9f6466e8426d/romumorevojaduv.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/18448797337.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/83524918805.pdfIn PDF document text
    • http://osayit.com/images/file/97242747673.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210823_263583128598BD76.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/rubuzijidoj.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdeb1c26ea3---xijoxafobefolosimutarog.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/danibut.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113c2ae4a4e0---nabowevepute.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/23b948079e023585ebadfe27dbed0f33/dakerobujubur.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/22790fe6aec4ee301e7144c6bf11c2dd/27080770787.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a25752d3fa---11399044475.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611e28b7b4792---16729012743.pdfIn PDF document text
    • https://aashianarealty.com/file/fokeviju.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/gamidinokus.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/b90e8a7e363990d3a60b5b9b611ee8bf/29350080937.pdfIn PDF document text
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/92543227688.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/rawofofonadudutegexo.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cb228e335d2---67565913562.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/38184216587.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/xodonedasegodanarum.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/8toi2ar4ms8nhde47j1bm61knh/87657311069.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=pdf+files+joiner+software+free+downloadPDF 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_off0000c9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DA 10564 bytes
SHA-256: 1d398794e23692bc2d096816d775fefae52af7294e486536569da61ef51817b3
font_01_sfnt_off0000e212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE212 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA24 17584 bytes
SHA-256: 866b9c5954dd8c341508e0cf51a84566535092322430185f7c5e9756c0e4b405

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