Malicious PDF — malware analysis report

Static analysis result for SHA-256 deef5f0138fd221d…

MALICIOUS

PDF

87.5 KB Created: 2021-07-03 19:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bb8ab0a8d0ea8affadf7bbe4b110359c SHA-1: 6877055bad00da3f6e4ee3314adc89a5305b92e9 SHA-256: deef5f0138fd221d9f595cee55d97e210f521f59c0f650c9799b112d6c5df1cd
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. These links likely serve as lures for phishing or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://zonwering-belgie.eu/ckfinder/userfiles/files/nasukupaluvilinepe.pdf In PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/e4af2f55ada6b706014830cda5928f69/tumuvuguwamufavudon.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/11e49a46ddc581657ad8eefe05b0d71a/tiwebedopak.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/hu9d07gcslujtlrtjkc288qb83/fafavozimazoto.pdfIn PDF document text
    • http://pritchardreunion.com/clients/81409/File/kowojodogonu.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d52d44593---43831012606.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16070fec610646---16723982824.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/87969630891.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160adce0bf157d---gisodifadakodaf.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/kesevujekex.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ioen7m6d5p9cd46q44ol2ib3km/saduroxaka.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a972e89190a---87754484739.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a53e9195d36---86432325039.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/31055867923.pdfIn PDF document text
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/tasofisazelimipevobazeze.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/e99bef79b1c8d5cfc1e6e7e60c6eabdf/13595151172.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075bc5e55f61---zuwibasuxaz.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/9921188826a93360e4f9ea3b75d0e394/62819197718.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/sulitigazimofenar.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/ginoloza.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/b6f334f42ff45a81602bab7d8f07872b/15098090665.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/ad03dc69da81d475a6bb87c706dec7ed/30061099000.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/021e844ca2aee90b912e07dbff33550d/81737819359.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=endorsement+of+chequesPDF 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_off0000ef10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF10 10672 bytes
SHA-256: 797018f4c72d276059cbbb30f4a7ed1ab7c1b3c6449e63af29b2df62b42994aa
font_01_sfnt_off0001071c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071C 19264 bytes
SHA-256: 91d152a0e855580dfec92bb9255b2d87db8884380002ec0f85ca3ee5e9875b06
font_02_sfnt_off000138b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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